Attachments
Highlights/updates since the last map was sent on PacNet on 16 December 2025:
Dengue
- Cook Islands: On 22 May 2025, the Cook Islands Ministry of Health declared a dengue outbreak in Rarotonga. As of 28 December 2025, 327 cases were reported, with 289 recovered and 38 still active. Most of the cases are in the 10-19 age group, and no fatalities or severe dengue cases have been reported. Of the 50 samples serotyped, 47 were DENV-1 and 3 were DENV-2, confirming co-circulation. Authorities are conducting clean-up and mass cleaning and spraying campaigns, urging the public to eliminate mosquito breeding sites, use repellents, wear protective clothing, and seek medical care if symptoms appear. The blue alert for DENV-1 and DENV-2 remains in effect. – Source: Cook Islands 2025 Dengue Outbreak Situation Report #73 (28 December 2025) shared with PPHSN Coordinating Body focal point on 23 December 2025.
Influenza
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French Polynesia: In French Polynesia, an outbreak of influenza has been declared with 115 influenza A cases confirmed in EpiWeek 50 (8 – 14 December 2025), a 50% increase compared to the previous week. Of these, forty-six cases required hospitalisation with four cases in intensive care. Influenza A(H3N2) is the predominant subtype. Seasonal flu vaccination is available for target groups at all healthcare facilities and selected pharmacies. A red alert for Influenza A remains in effect. – Source: Bulletin de surveillance sanitaire de Polynésie française n°47 - 2025 shared with PPHSN Coordinating Body focal point on 23 December 2025.
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Federated States of Micronesia: In the Federated States of Micronesia, the Yap Communicable Disease Report for EpiWeek 49 (1 – 7 December 2025) highlighted a significant surge in influenza-like-illness (ILI) with 136 cases reported, more than double the previous week, whichprompted the Yap EpiNet team to declare an influenza outbreak on 8 December 2025. The surge in ILI was detected in the outer islands, namely Woleai Atoll, Lamotrek and Elato. As of 22 December 2025, a total of 91 new ILI cases was reported bringing the cumulative total since 16 November 2025 to 569 cases. The laboratory confirmed 58 influenza A cases, including two subtyped as A(H3) and 3 respiratory syncytial viruses (RSV) infections. The most affected age group is 0-4 years with mainland Yap being the most affected area. A red alert for Influenza A remains in effect. – Sources: Yap Communicable Disease Report for Week 49 and State Department of Health Services, Situational Report No. 09 (22 December 2025) shared with PPHSN Coordinating Body focal point on 22 December 2025.
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Wallis and Futuna: As of 16 December 2025, Wallis and Futuna declared an Influenza A outbreak with 3 confirmed cases of Influenza A(H3N2). Surveillance indicators are above the threshold in Wallis and rising in Futuna, prompting measures such as mask-wearing when symptomatic, ventilation, and hand hygiene for the public. In ADS facilities, stricter protocols include mandatory masks, separate circuits for suspected cases, isolation of positives, enhanced surveillance, and reinforced communication. A red alert for Influenza A is now added. – Sources: Personal exchange with Wallis and Futuna focal point and Influenza A epidemic declared in Wallis and Futuna accessed on 23 December 2025.
Measles
- New Zealand: Since mid-October, New Zealand (NZ), has reported 32 confirmed measles cases with 28 cases now no longer infectious. The latest case is from Queenstown and is linked to overseas travel. The ongoing outbreak poses a very high risk of further spread despite extensive public health measures, including contact tracing after an Auckland airport exposure that led to eight secondary cases. To mitigate the risk to the Pacific, the Ministry of Health, Health New Zealand, and MFAT have implemented a cross-border plan, coordinated weekly updates with six Polynesian countries, and supported immunisation, laboratory capacity, and vaccine supply through partnerships with WHO, UNICEF, and other agencies. The measles locations of interest continue to be updated. Residents are urged to monitor for symptoms and to call their healthcare provider if unwell and check their immunisation status. A red alert for measles in New Zealand is now added. – Sources: Personal exchange with New Zealand Institute for Public Health and Forensic Science focal point, New Zealand Health: Measles outbreak update - Wednesday 17 December 2025 and Measles locations of interest accessed on 23 December 2025.
Pertussis/Whooping cough
- New Zealand: As of the week ending on 12 December 2025, weekly pertussis cases in New Zealand increased to 66 cases as compared to 52 in previous week ending on 5 December, bringing the total reported cases since the beginning of 2025 to 2,566. According to the latest report from the New Zealand Institute for Public Health and Forensic Science (PHF Science), 3,651 confirmed, probable and suspect cases have been notified since the start of the national epidemic on 19 October 2024. Of these, 325 cases (9.3%) have required hospitalisation with one reported death. Out of the 308 cases in infants under 1 year, 155 (51.3%) have been hospitalised. The blue alert remains in effect. – Sources: Pertussis dashboard and Pertussis report 15 November–12 December 2025 accessed on 23 December 2025.
Other Information:
Measles
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Canada: In Canada, for EpiWeek 50 (7 – 13 December 2025) there has been 24 new confirmed measles cases bringing the total to 5,353 cases (4,978 confirmed, 375 probable) making it the country with the highest number of reported cases in the Region of the Americas, with persistent transmission in provinces like Alberta, British Columbia and Manitoba. – Source: Government of Canada Measles and rubella weekly monitoring report Epi-week 50: 7 – 13 December 2025 accessed on 23 December 2025.
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United States: In the United States, the CDC reported a total of 1,958 measles cases across 44 U.S. jurisdictions as of 916 December 2025, with 88% of these cases linked to forty-nine outbreaks. The majority of cases are among unvaccinated individuals (93%), and 11% of the cases have resulted in hospitalization. There have been three confirmed deaths. The 44 jurisdictions that have reported measles cases are: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Missouri, Montana, Nebraska, Nevada, New Jersey, New Mexico, New York City, New York State, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, Wisconsin, and Wyoming. – Source: CDC Measles Cases and Outbreaks Update as of 16 December 2025, accessed on 16 December 2025.