Pacific: Dengue Outbreak - Feb 2025

Between 1 January and 1 December 2025, a total 20,717 of dengue confirmed cases, and 21 deaths have been reported across the Pacific. Pacific Syndromic Surveillance System has reported a total of 39,245 Dengue-like Illness (DLI) cases to date, reaching its highest weekly peak since 2016, with 2,249 cases recorded per week in August. The most affected countries—Fiji, French Polynesia, Samoa, and Tonga—account for 94% of confirmed cases. As of 1 December 2025: continued circulation of dengue remains in American Samoa, Cook Islands, Kiribati, Samoa, and Tuvalu; Cook Islands is experiencing a continued upward trend, with confirmed cases rising 22% in weeks 44–47 compared to the previous four‑week period; Kiribati, Samoa, and Tuvalu are showing a downward trend, with declining case numbers and reduced hospital admissions; French Polynesia declared the end of its two‑year surge on November 2025; The Governments of Fiji and Tonga declared the end of their dengue outbreaks in August 2025. (SPC & WHO, 1 Dec 2025)

American Samoa

On 8 July 2025, the American Samoa Department of Health declared a public health emergency due to a dengue fever outbreak. As of 10 July 2025, there have been a total of 9 laboratory-confirmed cases of dengue fever reported, of which eight are males and one female. Eight of these individuals required hospitalisation but remain in stable condition. Majority of the cases are occurring in children below 18years of age and three of which are adults. Out of the nine dengue cases reported, seven are imported and two are locally acquired cases with no recent travel history. The initial six cases were serotyped at the Hawaii State Lab, five were Dengue Virus Type 1 (DENV-1) and one was identified as Dengue Virus Type 2 (DENV-2). (Govt. of American Samoa, 15 Jul 2025)

As of 21 July 2025, there have been a total of 12 laboratory-confirmed cases of dengue fever reported, of which ten are imported and two are locally acquired. The initial six cases were serotyped at the Hawaii State Lab, five were Dengue Virus Type 1 (DENV-1) and one was identified as Dengue Virus Type 2 (DENV-2). (Govt. of American Samoa, 29 Jul 2025)

As of 8 August 2025, there have been a total of 34 laboratory-confirmed cases reported of which 28 are males and 6 females. Of the total cases, twenty-six of these cases are travel-related with links to Samoa while eight are locally acquired. The majority of cases are from the 11-16 years age group, followed by 16-20 years and 21-30 years. Clinically 28 patients have required hospital admission at some stage of their illness. All have since been discharged with no dengue haemorrhagic fever or other severe complications reported. Tafuna remains the most affected village, with other areas including Iliili, Leone, Malaimi, Nuli and Laulii. Of the initial six samples sent to the Hawaii State Lab, five were identified as Dengue Virus Type 1 (DENV-1) and one as Dengue Virus Type 2 (DENV-2). (Govt. of American Samoa, 12 Aug 2025)

As of 16 August 2025, there have been a total of 48 laboratory-confirmed cases have been reported. Most cases have recovered and been discharged, with no dengue haemorrhagic fever or other severe complications reported. (Govt. of American Samoa, 19 Aug 2025)

On 8 July 2025, American Samoa declared a public health emergency in response to a dengue outbreak, with 66 lab-confirmed cases reported by 20 August. Nearly all patients (95%) have recovered, and no severe complications or dengue haemorrhagic fever have been observed. (Govt. of American Samoa, 26 Aug 2025)

On 8 July 2025, American Samoa declared a public health emergency in response to a dengue outbreak, with 81 lab-confirmed cases reported by 29 August. Nearly all patients (93%) have recovered, and no severe complications or dengue haemorrhagic fever have been observed. (Govt. of American Samoa, 2 Sep 2025)

On 8 July 2025, American Samoa declared a public health emergency in response to a dengue outbreak, with 150 lab-confirmed cases reported by 15 September. There are nine cases admitted in hospital, and no severe complications or dengue haemorrhagic fever have been observed. (Govt. of American Samoa, 23 Sep 2025)

On 8 July 2025, American Samoa declared a public health emergency in response to a dengue outbreak, with 212 lab-confirmed cases reported by 29 September. There are eight cases admitted in hospital, and no severe complications or dengue haemorrhagic fever have been observed. (Govt. of American Samoa, 7 Oct 2025)

Since the last update on 23 October, 15 new cases have been reported bringing the total to 303 lab-confirmed cases. There are six cases admitted in hospital, and no severe complications or dengue haemorrhagic fever have been observed. (Govt. of American Samoa, 4 Nov 2025)

Since the last update on 4 November, 45 new cases have been reported bringing the total to 348 lab-confirmed cases. There are six cases admitted in hospital, and no severe complications or dengue haemorrhagic fever have been observed. (Govt. of American Samoa, 11 Nov 2025)

Cook Islands

The Ministry of Health has officially declared a dengue fever outbreak in Rarotonga on 22 May 2025, following confirmation of two new cases since 19 May. As of 22 May 2025, a total of 7 locally acquired dengue cases have been reported in the past 18 days reaching the outbreak threshold. Since February 2025, a total of eleven isolated cases have been recorded, with Tupapa recording the highest number of dengue cases, five out of eleven cases. Local transmission has been confirmed. The serotypes that are responsible for this current outbreak are Dengue Virus Type 1 (DENV-1) and Dengue Virus Type 2 (DENV-2). (Govt. of Cook Islands, 27 May 2025)

As of 28 May 2025, a total of 17 dengue cases have been reported, with nine currently considered active and eight have fully recovered. Tupapa is recording the highest number of dengue cases with six out of seventeen cases. Local transmission has been confirmed. (Govt. of Cook Islands, 3 Jun 2025)

No new cases have been reported since the 30 May 2025, keeping the total confirmed number of dengue cases at 17. Tupapa is recording the highest number of dengue cases with six out of seventeen cases. (Govt. of Cook Islands, 10 Jun 2025)

Since February, there have been 50 dengue cases reported. Of these, 44 individuals have fully recovered while 6 cases remain active. Twelve cases required hospitalisation with 10 now discharged. Of the twenty-seven samples with confirmed serotypes, twenty-four were Dengue Virus Type 1 (DENV-1) and three were Dengue Virus Type 2 (DENV-2), indicating co-circulation of DENV-1 and DENV-2. (Govt. of Cook Islands, 8 Jul 2025)

As of 18 July 2025, 67 confirmed dengue cases have been reported with 51 individuals fully recovered and 16 cases still active. Of the fifty samples with confirmed serotypes, forty-seven were Dengue Virus Type 1 (DENV-1) and three were Dengue Virus Type 2 (DENV-2), indicating co-circulation of DENV-1 and DENV-2. (Govt. of Cook Islands, 22 Jul 2025)

As of 23 July 2025, 73 confirmed dengue cases have been reported with 65 individuals fully recovered and 8 cases still active. Of the fifty samples with confirmed serotypes, forty-seven were Dengue Virus Type 1 (DENV-1) and three were Dengue Virus Type 2 (DENV-2), indicating co-circulation of DENV-1 and DENV-2. (Govt. of Cook Islands, 29 Jul 2025)

As of 6 August 2025, 83 confirmed dengue cases have been reported with 77 individuals fully recovered and 6 cases still active. Of the fifty samples with confirmed serotypes, forty-seven were Dengue Virus Type 1 (DENV-1) and three were Dengue Virus Type 2 (DENV-2), indicating co-circulation of DENV-1 and DENV-2. (Govt. of Cook Islands, 12 Aug 2025)

As of 18 August 2025, 93 confirmed dengue cases have been reported, of which eighty-four have fully recovered while nine remain active. (Govt. of Cook Islands, 19 Aug 2025)

On 22 May 2025, the Cook Islands Ministry of Health declared a dengue outbreak in Rarotonga, with 95 cases reported by 18 August, 85 recovered and 10 still active. Of 50 serotyped samples, 47 were DENV-1 and 3 were DENV-2, confirming co-circulation. (Govt. of Cook Islands, 26 Aug 2025)

On 22 May 2025, the Cook Islands Ministry of Health declared a dengue outbreak in Rarotonga, with 149 cases reported by 17 September, 130 recovered and 19 still active. Most of the cases belong to the 10-19 age group with no fatalities or severe dengue cases reported. Of 50 serotyped samples, 47 were DENV-1 and 3 were DENV-2, confirming co-circulation. (Govt. of Cook Islands, 23 Sep 2025)

On 22 May 2025, the Cook Islands Ministry of Health declared a dengue outbreak in Rarotonga, with 157 cases reported by 24 September, 150 recovered and 8 still active. (Govt. of Cook Islands, 7 Oct 2025)

Fiji

As of 03 February 2025, The Ministry of Health and Medical Services has declared a dengue fever outbreak in the Western Division due to a significant rise in cases above expected levels. Since the beginning of the year, 200 cases have been reported, primarily affecting individuals aged 10-29 years. In response, a Dengue Action Plan has been implemented, with ongoing monitoring by divisional heads and senior managers. (Govt. of Fiji, 4 Feb 2025)

As of 23 March 2025, the Ministry of Health and Medical Services reported 5,128 cases of dengue nationally with 2841 cases in the Western division, 1095 cases in the North, 1090 cases in Central and 102 cases in the Eastern division. Additionally, there has been 1,511 admissions nationwide with 4 deaths reported. In addition to the ongoing outbreak that was declared in the Western division on 03 February 2025, the Ministry of Health and Medical Services have since declared a dengue fever outbreak in the Central Division on 11 April 2025 with the most recent increase of cases in March seen to be above the expected levels for the same period last year. The surge in cases have been observed over the last three weeks in the subdivisions within Central while there has also been an increase in admissions of dengue fever cases at the subdivisional hospitals and at the main tertiary hospital. (Govt. of Fiji, 15 Apr 2025)

As of 21 May 2025, the Ministry of Health and Medical Services reported 8,708 cases of dengue nationally with 4,357 cases in the Western division, 2092 cases in the Central, 2048 cases in Northern and 211 cases in the Eastern division. Additionally, there has been 1,768 admissions nationwide with more cases expected as health facilities continue to report cases. Four (4) deaths have been reported verified as attributed to dengue fever. (Govt. of Fiji, 3 Jun 2025)

French Polynesia

In epi week 37, 5 confirmed cases of Dengue Fever were reported (compared to 13, 19, 16 and 18 confirmed cases in epi weeks 35, 34, 33 and 32), with 2 hospitalizations (compared to 0, 0, 0 and 1 hospitalizations in epi weeks 35, 34, 33 and 32) and 0 deaths (compared to 0, 0, 0 and 0 deaths in epi weeks 35, 34, 33 and 32). (Govt. of French Polynesia, 29 Sep 2025)

In EpiWeek 39, 10 new dengue cases (six confirmed and four probable) were reported. Since November 27, 2023, a total of 2,636 cases has been recorded, including 2,358 confirmed and 278 probable cases. No hospitalisations reported in EpiWeek 39. The positivity rate increased this week as compared to last week. (Govt. of French Polynesia, 7 Oct 2025)

The French Polynesia Health Department announced in its latest surveillance bulletin the end of the dengue epidemic. In EpiWeek 44, 3 new confirmed dengue cases were reported. Since November 27, 2023, a total of 2,674 cases has been recorded, including 2,392 confirmed and 282 probable cases. (Govt. of French Polynesia, 11 Nov 2025)

Guam

The Department of Public Health and Social Services (DPHSS) received one (1) laboratory confirmed Dengue fever report, September 18, 2025. This is the first confirmed dengue case for 2025. Through epidemiologic investigation, DPHSS has determined that this is most likely an imported case. (Govt. of Guam, 22 Sep 2025)

Kiribati

The Ministry of Health confirmed a dengue outbreak on 24 April 2025, after a significant rise in confirmed cases. As of 12 May 2025, the Health Ministry reported a total of 51 dengue confirmed cases and 93 suspected dengue cases with twelve cases admitted, of which ten has been discharged. Dengue cases range in age from 8 months to 67 years, with the most affected group being those aged 20 to 39 years. Among all reported cases, 56% are female and 44% male. The serotypes that are responsible for this current outbreak are Dengue Virus Type 1 (DENV-1) and Dengue Virus Type 2 (DENV-2), tested at VIDRL in Melbourne. (Govt. of Kiribati, 20 May 2025)

As of 22 May 2025, the Health Ministry reported a total of 55 dengue confirmed cases and 163 suspected dengue cases with twenty-nine cases admitted, of which twenty-five has been discharged. Dengue cases range in age from 8 months to 75 years, with the most affected group being those aged 20 to 39 years. Among all reported cases, 54% are female and 46% male. (Govt. of Kiribati, 27 May 2025)

As of 29 May 2025, the Ministry reported a total of 55 dengue confirmed cases and 225 suspected dengue cases with thirty-four cases admitted, of which twenty-nine have been discharged. Dengue cases range in age from 8 months to 84 years, with the most affected group being those aged 3 to 9 years and 20 to 39 years age group. Among all reported cases, 43% are female and 57% male. (Govt. of Kiribati, 3 Jun 2025)

As of 9 June 2025, the Ministry reported a total of 96 dengue confirmed cases and 383 suspected dengue cases with forty-two cases admitted, of which thirty-nine have been discharged. Dengue cases range in age from 1 month to 84 years, with the most affected group being those aged 10-19 years age group. Among all reported cases, 53% are female and 47% male. (Govt. of Kiribati, 10 Jun 2025)

As of 28 July 2025, the Health Ministry reported a total of 375 dengue confirmed cases and 972 suspected dengue cases with 65 cases admitted, of which 63 have now been discharged. Dengue cases range in age from 1 month to 95 years, with the most affected group being those aged 3 to 9 years. Among all reported cases, 53% are female and 47% male. (Govt. of Kiribati, 29 Jul 2025)

As of 11 August 2025, the Health Ministry reported a total of 406 dengue confirmed cases and 1,075 suspected dengue cases with 67 hospitalisations, all of which have been discharged. Dengue cases range in age from 1 month to 95 years, with the most affected group being those aged 3 to 9 years. Among all reported cases, 54% are female and 46% male. The serotypes that are responsible for this current outbreak are Dengue Virus Type 1 (DENV-1) and Dengue Virus Type 2 (DENV-2), tested at VIDRL in Melbourne. (Govt. of Kiribati, 12 Aug 2025)

As of 28 August 2025, the Health Ministry reported a total of 446 confirmed dengue cases and 1,213 suspected dengue cases with 68 hospitalisations, all of which have been discharged, and one confirmed death. (Govt. of Kiribati, 2 Sep 2025)

As of 3 September 2025, the Health Ministry reported a total of 470 confirmed dengue cases and 1,319 suspected dengue cases with 68 hospitalisations, all of which have been discharged, and one confirmed death. There have been 24 new cases since the last report on 28 August 2025. (Govt. of Kiribati, 9 Sep 2025)

As of 23 September 2025, the Health Ministry reported a total of 487 confirmed dengue cases and 1,399 suspected dengue cases with 68 hospitalisations, all of which have been discharged, and one confirmed death. There have been 17 new cases since the last report on 16 September 2025. (Govt. of Kiribati, 23 Sep 2025)

As of 28 October 2025, the Health Ministry reported a total of 495 confirmed dengue cases and 1,452 suspected dengue cases with 68 hospitalisations, all of which have been discharged, and one confirmed death. There has been one new case since the last report on 22 October 2025. (Govt. of Kiribati, 4 Nov 2025)

As of 5 November 2025, the Health Ministry reported a total of 495 confirmed dengue cases and 1,460 suspected dengue cases with 68 hospitalisations, all of which have been discharged, and one confirmed death. (Govt. of Kiribati, 11 Nov 2025)

Nauru

Dengue cases were initially reported by the Republic of Nauru (RON) Hospital on 27 June 2025. As of 19 July 2025, the Ministry of Health reported 125 dengue confirmed cases of which 58% are males and 52% females. The most affected age group is the 5-10years with 75% of the total cases are less than 18years old. The youngest case was 11-month-old, and the oldest case was 64 years old. A total of 11 cases were reported hospitalised. The cases are distributed all over the island with majority of the cases from Meneng (25) followed by Denigomodu (20), Aiwo (14) and Baitsi (12). (Govt. of Nauru, 22 Jul 2025)

As of 24 July 2025, the Ministry of Health reported 200 dengue confirmed cases. Nearly 90% of these are children aged 1 to 14 years, with the highest concentration of cases reported from the districts of Meneng, Denigomodu (Locations settlement), and Aiwo. All districts, except Ijuw, have recorded cases. (Govt. of Nauru, 29 Jul 2025)

As of 18 August 2025, the Ministry of Health has confirmed 379 dengue cases out of the 1,158 tests conducted. Two fatalities were recorded on 30 July 2025, a 15-year-old male and 17-year-old female, with a total of 98 admissions with 4 cases currently admitted. The majority of cases are among children between the age of 5-10 years with 77% of the total cases being less than 18 years old. The cases are widely distributed across the island, with most of the cases from Meneng, Denigomodu, Aiwo, Boe and Baitsi. (Govt. of Nauru, 19 Aug 2025)

As of 24 August 2025, Nauru has recorded 412 confirmed dengue cases, with five new cases since the previous update. Children under 18 remain the most affected group, particularly those aged 5–10, and two new paediatric admissions bring total hospitalisations to 105, including two deaths. Most cases are concentrated in districts like Aiwo, Denigomodu, and Meneng. (Govt. of Nauru, 26 Aug 2025)

As of 2 September 2025, the Ministry of Health has confirmed 440 dengue cases out of the 1,425 tests conducted. Two fatalities were recorded on 30 July 2025, a 15-year-old male and 17-year-old female, with a total of 110 admissions with no cases currently admitted. The majority of cases are among children between the age of 5-10 years with 76% of the total cases being less than 18 years old. The cases are widely distributed across the island, with most of the cases from Aiwo, Denigomodu, Meneng, Buada, Anetan, Boe and Baitsi. (Govt. of Nauru, 2 Sep 2025)

As of 5 September 2025, the Ministry of Health has confirmed 446 dengue cases out of the 1,483 tests conducted. Two fatalities were recorded on 30 July 2025, a 15-year-old male and 17-year-old female, with a total of 113 admissions with 3 cases currently admitted. The majority of cases are among children between the age of 5-10 years with 76% of the total cases being less than 18 years old. The cases are widely distributed across the island, with most of the cases from Aiwo, Denigomodu, Meneng, Buada, Anetan, Boe and Baitsi. (Govt. of Nauru, 9 Sep 2025)

Nauru reported 1 confirmed Dengue Fever case on 10th September 2025 (SITREP 62), bringing the cumulative number of reported Dengue Fever cases to 447. From 11th to 14th September 2025, no new confirmed cases of Dengue Fever have been reported. Cumulatively, 113 admissions (no currently admitted cases) and 2 deaths have been reported. Cases are distributed all over the Island. The most affected districts are Meneng, Denigomodu, Aiwo, Boe and Baitsi. (Govt. of Nauru, 19 Sep 2025)

As of 19 September 2025, the Ministry of Health has confirmed 453 dengue cases out of the 1,535 tests conducted. Six new cases reported since the last PacNet update on 16 September. (Govt. of Nauru, 23 Sep 2025)

Palau

No new Dengue Fever cases were reported in this current week (epi week 34, 2025). From 1st July and 3rd August 2025, 7 cases of Dengue among residents had been confirmed. DENV-1 and DENV-2 have been detected in 2 of the submitted samples. (Govt. of Palau, 2 Sep 2025)

No new Dengue Fever cases were reported in epi weeks 35 and 36, 2025. From 1st July and 3rd August 2025, 7 cases of Dengue among residents had been confirmed. DENV-1, DENV-2 and DENV-3 have been detected in submitted samples. (Govt. of Palau, 9 Sep 2025)

No new Dengue Fever cases were reported in epi weeks 35, 36 and 37, 38 and 39 2025. From 1st July and 3rd August 2025, 7 cases of Dengue among residents had been confirmed. (Govt. of Palau, 29 Sep 2025)

In epi week 40, 2025, no new Dengue Fever cases were reported, as it was the case in epi weeks 35, 36 and 37, 38 and 39, 2025. From 1st July and 3rd August 2025, 7 cases of Dengue among residents had been confirmed. (Govt. of Palau, 13 Oct 2025)

Samoa

As of 17 April 2025, the Ministry of Health has declared a dengue fever outbreak in Samoa with 15 confirmed dengue cases reported since January 2025 and one reported death. The 12-year-old boy died of haemorrhagic dengue fever after being medevacked to New Zealand. Most of the cases have been reported at Moto’otua Main Hospital particularly in the Northwest of Upolu with all age groups affected. Majority of the patients are recovering without the need for hospitalization. (Govt. of Samoa, 14 Apr 2025)

As of 21 April 2025, the Ministry of Health reported six lab-confirmed dengue cases in EpiWeek 16; 14 – 20 April 2025, bringing the total confirmed cases to 21 and one reported death since the declaration of the outbreak on 17 April 2025. Most of the cases have been reported at Moto’otua Main Hospital particularly in the Northwest of Upolu with all age groups affected. Currently the dengue serotype is undetermined. (Govt. of Samoa, 14 Apr 2025)

As of 28 April 2025, the Ministry of Health reported eighteen lab-confirmed dengue cases in EpiWeek 17; 21 – 27 April 2025, bringing the total confirmed cases to 36 and one reported death since the declaration of the outbreak on 17 April 2025. 94% of the cases are reported from Upolu Island; 56% male and 44% female. The 15–19-year-olds are the most affected age group with 36% of the cases requiring hospitalization. 74% of the cases received vector control measures follow-up, which includes environmental assessments and outdoor residual spraying. Five dengue cases have confirmed dengue virus serotypes; three with DENV-2 and two with DENV-1. (Govt. of Samoa, 6 May 2025)

As of 19 May 2025, the Ministry of Health reported 29 lab-confirmed dengue cases in EpiWeek 20 (12-18 May 2025) bringing the total number of confirmed cases to 110 and one reported death since the declaration of the outbreak on 17 April 2025. The majority of cases (77%) are from Upolu Island, with an equal split between males and females. Most cases are concentrated in the Apia Urban Area and the Northwest Upolu regions, with individuals under 20 years old (69%) being the most affected. 22% of cases require hospitalisation, and of these admissions, 88% have been discharged. Of the 20 cases that have confirmed serotypes, 85% are DENV-1 and 15% are DENV-2. (Govt. of Samoa, 27 May 2025)

As of 26 May 2025, the Ministry of Health reported 56 lab-confirmed dengue cases in EpiWeek 21 (19-25 May 2025) bringing the total number of confirmed cases to 166 and one reported death since the declaration of the outbreak on 17 April 2025. The majority of cases (76%) are from Upolu Island, with an equal split between males and females. Most cases are concentrated in the Apia Urban Area and the Northwest Upolu regions, with individuals under 20 years old (74%) being the most affected. 22% of cases require hospitalisation, and of these admissions, 95% have been discharged. Of the 20 cases that have confirmed serotypes, 85% are DENV-1 and 15% are DENV-2. (Govt. of Samoa, 3 Jun 2025)

As of 2 June 2025, the Ministry of Health reported 211 lab-confirmed dengue cases in EpiWeek 22 (26 May-01 June 2025) bringing the total number of confirmed cases to 211 and one reported death since the declaration of the outbreak on 17 April 2025. The majority of cases (76%) are from Upolu Island, with 52% male and 48% female. Most cases are concentrated in the Apia Urban Area and the Northwest Upolu regions, with individuals under 20 years old (77%) being the most affected. 24% of cases required hospitalisation, and of these admissions, 84% have been discharged. Of the 20 cases with confirmed serotypes, 85% are DENV-1 and 15% are DENV-2. (Govt. of Samoa, 10 Jun 2025)

As of 30 June 2025, the Ministry of Health reported 140 lab-confirmed dengue cases in EpiWeek 26 (23 – 29 June 2025) bringing the total number of confirmed cases to 703 and one reported death since the declaration of the outbreak on 17 April 2025. The majority of cases (82%) are from Upolu Island, with 55% male and 45% female. Most cases are distributed across the Apia Urban Area and North West of Upolu regions, with individuals under 20 years old (86%) being the most affected. 11% of cases required hospitalisation, and of these admissions, 96% have been discharged. Of the 20 cases with confirmed serotypes, 85% are DENV-1 and 15% are DENV-2. (Govt. of Samoa, 8 Jul 2025)

As of 7 July 2025, the Ministry of Health reported 237 lab-confirmed dengue cases in EpiWeek 27 (30 June – 6 July 2025) bringing the total number of confirmed cases to 945 and one reported death since the declaration of the outbreak on 17 April 2025. The majority of cases (82%) are from Upolu Island, with 55% male and 45% female. Most cases are distributed across the Apia Urban Area and North West of Upolu regions, with individuals under 20 years old (86%) being the most affected. 10% of cases required hospitalisation, and of these admissions, 88% have been discharged. Of the 20 cases with confirmed serotypes, 85% are DENV-1 and 15% are DENV-2. (Govt. of Samoa, 15 Jul 2025)

As of 14 July 2025, the Ministry of Health reported 331 lab-confirmed dengue cases in EpiWeek 28 (7 – 13 July 2025) bringing the total number of confirmed cases to 1276. This week the Ministry also confirmed the death of an 8-year-old child from Vailoa Faleata, marking the second fatality reported since the declaration of the outbreak on 17 April 2025. The majority of cases (81%) are from Upolu Island, with 55% male and 45% female. Most cases are distributed across the Apia Urban Area and North West of Upolu regions, with individuals under 20 years old (87%) being the most affected. 10% of cases required hospitalisation, and of these admissions, 76% have been discharged. Of the 20 cases with confirmed serotypes, 85% are DENV-1 and 15% are DENV-2. (Govt. of Samoa, 22 Jul 2025)

As of 28 July 2025, the Ministry of Health reported 521 lab-confirmed dengue cases in EpiWeek 30 (21 – 27 July 2025) bringing the total number of confirmed cases to 2,277 and two reported deaths since the declaration of the outbreak on 17 April 2025. The majority of cases (91%) are from Upolu Island, with 55% male and 45% female. Most cases are distributed across the Apia Urban Area and North West of Upolu regions, with individuals under 15 years old (71%) being the most affected. 12% of cases required hospitalisation, and of these admissions, 88% have been discharged. Of the 20 cases with confirmed serotypes, 85% are DENV-1 and 15% are DENV-2. (Govt. of Samoa, 29 Jul 2025)

As of 17 August 2025, the Ministry of Health reported 9,571 clinically diagnosed dengue cases, of which 3,070 are lab-confirmed and six dengue-related deaths since the declaration of the outbreak on 17 April 2025. 72% of these cases are children under the age of 15 years. 50 cases are admitted with 1 case admitted to ICU. (Govt. of Samoa, 19 Aug 2025)

As of 24 August 2025, Samoa Ministry of Health has recorded a total of 10,982 clinically diagnosed dengue cases since January, including 3,379 lab-confirmed cases, with six dengue-related deaths. Children under 15 years account for 72% of cases, and the circulating serotypes remain predominantly DENV-1 (91%) and DENV-2 (9%). Case numbers dropped by 19% compared to the previous EpiWeek, with 1,307 new clinical cases and 309 lab-confirmed. Hospital admissions also declined by 14%, with 184 new admissions, 129 discharges, and 55 patients still hospitalised, none in ICU. The most affected districts were Anoamaa (67 cases) in Upolu and Palauli (38 cases) in Savai’i. (Govt. of Samoa, 26 Aug 2025)

In epi week 34, 309 laboratory confirmed cases of Dengue Fever were reported in addition to 365, 116, 342 and 521 laboratory confirmed cases of reported in epi weeks 33, 32, 31 and 30 respectively. This brings the cumulative number of confirmed cases (since January 2025) to 3,379. Majority of the confirmed cases (85%) are serotype 1. Cumulatively, 6 deaths have been reported including 0 deaths in the current epi week (34, 2025). In the current epi week, 55 are still admitted including 0 cases in ICU. (Govt. of Samoa, 2 Sep 2025)

As of 31 August 2025, Samoa Ministry of Health has recorded a total of 12,025 clinically diagnosed dengue cases since January, including 3,630 lab-confirmed cases, with six dengue-related deaths. Children under 15 years account for 73% of cases, and the circulating serotypes remain predominantly DENV-1 (91%) and DENV-2 (9%). Case numbers decreased by 20% compared to the previous EpiWeek, with 1,043 new clinical cases and 251 lab-confirmed. Hospital admissions decreased by 11%, with 163 new admissions, 156 discharges, and 49 patients still hospitalised, none in ICU. The most affected districts were Anoamaa (62 cases) in Upolu and Palauli (31 cases) in Savai’i. (Govt. of Samoa, 9 Sep 2025)

As of 15 September 2025, Samoa Ministry of Health has recorded a total of 13,543 clinically diagnosed dengue cases since January, including 4,004 lab-confirmed cases, with six dengue-related deaths. (Govt. of Samoa, 23 Sep 2025)

As of 29 September 2025, Samoa Ministry of Health has recorded a total of 14,435 clinically diagnosed dengue cases since January, including 4,259 lab-confirmed cases. One additional dengue-related death has been recorded, bringing the total number of deaths to seven. (Govt. of Samoa, 7 Oct 2025)

As of 27 October 2025, Samoa Ministry of Health has recorded a total of 15,339 clinically diagnosed dengue cases since January among which 4,479 are confirmed cases, and seven dengue-related deaths. (Govt. of Samoa, 4 Nov 2025)

As of 2 November 2025, Samoa Ministry of Health has recorded a total of 15,655 clinically diagnosed dengue cases since January among which 4,529 are confirmed cases, and seven dengue-related deaths. (Govt. of Samoa, 11 Nov 2025)

Tonga

The Ministry of Health declared an outbreak of Dengue Fever (DF) for Tonga on 19 February 2025. [...] 42 new cases reported with positive rapid test and that brings up the total cases of DF to 52. Majority of confirmed cases from Vava’u (25), the rest from Tongatapu (17) and ‘Eua (10). Age group mostly affected is 10-19 years old. 10 cases are hospitalized, 2 in Vaiola Hospital and 8 in Prince Ngu Hospital. 3 of these cases are diagnosed with dengue hemorrhagic fever (DHF). No death reported so far. (Govt. of Tonga, 21 Feb 2025)

As of today, 4 new cases reported with positive rapid test, that brings up the total DF cases to 73. Majority of confirmed cases from Tongatapu (33), the rest from Vava’u (28) and ‘Eua (12). Age group mostly affected is 10-19 years old. A total of 5 cases are currently hospitalized (4 Vaiola, 1 Niu’eiki), and all are stable. No dengue-related death reported so far. It is now confirmed that Dengue Virus Type 2 is responsible for the current dengue outbreak in Tonga according to the first batch of samples collected from Tongatapu. The result for the 2nd batch which included samples from Vava’u and ‘Eua is expected to be available later this week. Preventative activities to hot spot and high risk areas in collaboration with Tonga Red Cross Society, are ongoing with continuous technical support from WHO, UNICEF and SPC. (Govt. of Tonga, 26 Feb 2025)

As of 28 April 2025, the Ministry of Health reported six new dengue cases, bringing the total confirmed cases to 588 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. Two dengue-related deaths have been reported to date and eight patients are currently hospitalised and in stable condition. (Govt. of Tonga, 29 Apr 2025)

As of 5 May 2025, the Ministry of Health reported twenty-two new dengue cases, bringing the total confirmed cases to 647 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. Three dengue-related deaths have been reported to date and six patients are currently hospitalised and in stable condition. (Govt. of Tonga, 6 May 2025)

As of 12 May 2025, the Ministry of Health reported fifteen new dengue cases, bringing the total confirmed cases to 697 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. Three dengue-related deaths have been reported to date and ten patients are currently hospitalised and in stable condition. (Govt. of Tonga, 13 May 2025)

As of 26 May 2025, the Ministry of Health reported thirteen new dengue cases, bringing the total confirmed cases to 793 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. Three dengue-related deaths have been reported to date and three patients are currently hospitalised and in stable condition. (Govt. of Tonga, 27 May 2025)

As of 2 June 2025, the Ministry of Health reported nine new dengue cases, bringing the total confirmed cases to 824 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. Three dengue-related deaths have been reported to date and three patients are currently hospitalised and in stable condition. (Govt. of Tonga, 3 Jun 2025)

As of 9 June 2025, the Ministry of Health reported eight new dengue cases, bringing the total confirmed cases to 845 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. Three dengue-related deaths have been reported to date and two patients are currently hospitalised and in stable condition. (Govt. of Tonga,10 Jun 2025)

As of 4 July 2025, the Ministry of Health reported five new dengue cases, bringing the total confirmed cases to 889 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. To date, three dengue-related deaths have been reported, with no patients currently hospitalised. (Govt. of Tonga, 8 Jul 2025)

As of 11 July 2025, the Ministry of Health reported eight new dengue cases, bringing the total confirmed cases to 897 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. To date, three dengue-related deaths have been reported, with no patients currently hospitalised. (Govt. of Tonga, 15 Jul 2025)

As of 25 July 2025, the Ministry of Health reported two new dengue cases, bringing the total confirmed cases to 904 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. To date, three dengue-related deaths have been reported, with no patients currently hospitalised. (Govt. of Tonga, 29 Jul 2025)

As of 27 July 2025, the Ministry of Health reported three new dengue cases, bringing the cumulative total to 907 confirmed cases since the outbreak was declared on 19 February 2025. (Govt. of Tonga, 19 Jul 2025)

Tonga’s Ministry of Health officially declared the end of the dengue fever outbreak on 20 August 2025, after two consecutive weeks with zero reported cases. The outbreak began on 19 February 2025 and resulted in 907 cases, with most cases from Tongatapu (521), followed by Vava’u (312), ‘Eua (70), and Ha’apai (4). (Govt. of Tonga, 26 Aug 2025)

Tuvalu

The Tuvalu Department of Health declared a dengue outbreak on June 5, followed by the release of a dengue alert. As of 13 June 2025, there are 2 confirmed dengue cases and 1 probable case. One case has been identified as Dengue Virus Type 2 (DENV-2). (SPC,1 Jul 2025)

As of 21 June 2025, 17 confirmed dengue cases have been reported, with seven cases hospitalised. The circulating serotype is Dengue Virus Type 2 (DENV-2). (Govt. of Tuvalu, 22 Jul 2025)

As of 28 July 2025, 37 confirmed dengue cases have been reported, with eleven cases hospitalised. The circulating serotype is Dengue Virus Type 2 (DENV-2). (Govt. of Tuvalu, 29 Jul 2025)

As of 17 August 2025, 87 confirmed dengue cases have been reported. Of these, 71% have recovered, while 22 cases remain active, all located on Funafuti. A total of 10 cases were hospitalised, comprising 60% paediatric and 40% adult patients. Among the total cases, 52 are males and 35 females. The majority of cases are from the 5-14 years age group with the youngest being 3 months old and the oldest 54 years old. The cases are widely distributed along Fongafale with hotspots identified including Fakaifou, Senala and Alapi. (Govt. of Tuvalu, 19 Jul 2025)

As of 24 August 2025, 360 suspected cases have been tested, with 108 confirmed positive. The outbreak is caused by Dengue Virus Type 2 (DENV-2). Currently, 83% of cases have recovered, while 18 remain active on Funafuti. Twelve patients (six children and six adults) have been hospitalised since the start of the outbreak, with two still in hospital showing warning signs. No deaths have been reported. (Govt. of Tuvalu, 26 Aug 2025)

As of 31 August 2025, 422 suspected cases have been tested, with 131 confirmed positive. Among these, one confirmed case was reported on Nanumaga, one of Tuvalu’s outer islands. The outbreak is caused by Dengue Virus Type 2 (DENV-2). Currently, 77% of cases have recovered, while 30 remain active on Funafuti. Twelve patients (six children and six adults) have been hospitalised since the start of the outbreak, with no cases currently admitted. No deaths have been reported. (Govt. of Tuvalu, 2 Sep 2025)

As of 7 September 2025, 482 suspected cases have been tested, with 152 confirmed positive. Among these, two confirmed cases were reported on Nanumaga and Nukufetau, two of Tuvalu’s outer islands. The outbreak is caused by Dengue Virus Type 2 (DENV-2). Currently, 82% of cases have recovered, while 26 remain active on Funafuti. Twelve patients (six children and six adults) have been hospitalised since the start of the outbreak, with no cases currently admitted. No deaths have been reported. (Govt. of Tuvalu, 9 Sep 2025)

To date, out of 540 DLI cases tested, 156 have tested positive. Twenty-two cases are still active. More than 66% of the cases are under 14 years of age. The outbreak is caused by DENV-2. Cumulatively, 12 cases have been hospitalized out of which 0 are still hospitalized. Cumulatively, no death has been reported. (Govt. of Tuvalu, 19 Sep 2025)

As of 21 September 2025, 620 suspected cases were tested, with 193 confirmed positive. The dengue cases are widely distributed along Fongafale and two outer islands, Nanumaga (5 cases) and Nukufetau (6 cases). (Govt. of Tuvalu, 23 Sep 2025)

As of 5 October 2025, 713 suspected cases were tested, with 218 confirmed positive. The dengue cases are widely distributed along Fongafale and two outer islands, Nanumaga (9 cases) and Nukufetau (10 cases). (Govt. of Tuvalu, 7 Oct 2025)

As of 2 November 2025, 848 suspected cases were tested, with no new cases reported since the last update. The number of confirmed positive cases remains at 238. The dengue cases are widely distributed along Fongafale, one atoll, Amatuku and three outer islands, Nanumaga (9 cases) Nukufetau (14 cases) and Vaitupu (1 case). (Govt. of Tuvalu, 4 Nov 2025)