Attachments
Highlights/updates since the last map was sent on PacNet on 2 December 2025:
Dengue
- Tuvalu: The Tuvalu Department of Health declared a dengue outbreak on 5 June 2025. As of 5 December 2025, 923 suspected cases were tested, with 6 new cases reported since the last update on 23 November 2025. The total number of confirmed positive cases is 248. 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). The outbreak is due to Dengue Virus Type 2 (DENV-2). Currently, 99% of cases have recovered, while 5 remain active. 12 patients (six children and six adults) have been hospitalised since the start of the outbreak, with no current admissions and no deaths reported. Children under 14 years account for 73% of cases ranging in age from 3 months to 80 years. Of the confirmed cases, 149 cases are males and 99 females. The Department of Health continues to implement control measures, including response team coordination, technical support and assistance from external partners (SPC, PacMOSSI, WHO and DFAT), targeted spraying and ongoing public awareness through talkback shows and community engagement. The blue alert for DENV-2 remains in effect. – Source: Dengue Fever Outbreak, Situation report #23 (5 December 2025) shared with PPHSN Coordinating Body focal point on 9 December 2025.
Influenza
- French Polynesia: In French Polynesia, an outbreak of influenza has been declared with 35 influenza A cases confirmed in EpiWeek 48 (24 – 30 November 2025), more than double the number in the previous week. Of these, thirteen cases required hospitalisation. 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 is added. – Source: Bulletin de surveillance sanitaire de Polynésie française n°45 - 2025 shared with PPHSN Coordinating Body focal point on 9 December 2025.
Pertussis/Whooping cough
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Vanuatu: The Vanuatu Ministry of Health officially declared a Pertussis (Whooping Cough) outbreak on Tanna Island, Tafea Province on 18 August 2025. As of 30 November 2025, 656 cases have been reported across Tanna, Efate, Nguna, Erromango and Futuna, including 3 infant deaths with a decrease in hospitalisation. Cases reported on Efate are epidemiologically linked to the initial Outbreak in Tanna. Based on confirmed local transmission, pertussis outbreak is also declared in Erromango, Nguna and Futuna. Most of the cases are above 1 year of age, with Vanuatu National hospital reporting the highest number of pertussis cases during the outbreak period. Out of the 8 clinical samples sent to Victorian Infectious Diseases Reference Laboratory (VIDRL), 7 have tested positive for Bordetella pertussis with an additional 19 confirmed cases reported from tests conducted locally in Vanuatu. In response, the Ministry of Health activated emergency operations centres and partnered with UNICEF, WHO, and other stakeholders to coordinate outreach, media campaigns, and door-to-door vaccination drives in hotspot areas. Community engagement, education, and collaboration with local leaders have been key to promoting early health-seeking behaviour and increasing vaccine uptake. The red alert for pertussis remains in effect. – Sources: Vanuatu is currently facing an outbreak of pertussis, and Pertussis in Vanuatu Situation Update #9 (6 July – 30 November 2025) shared with PPHSN Coordinating Body focal point on 2 December 2025.
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New Zealand: As of the week ending on 28 November 2025, weekly pertussis cases in New Zealand increased to 48, as compared to 44 in previous week ending on 21 November, bringing the total reported cases since the beginning of 2025 to 2,446. According to the latest report from the New Zealand Institute for Public Health and Forensic Science (PHF Science), 3,434 confirmed, probable and suspect cases have been notified since the start of the national epidemic on 19 October 2024. Of these, 299 cases (9.3%) have required hospitalisation with one reported death. Out of the 288 cases in infants under 1 year, 146 (52%) have been hospitalised. The blue alert remains in effect. – Sources: Pertussis dashboard and Pertussis Report 18 October–14 November 2025 accessed on 9 December 2025.
Other Information:
Influenza
- New Caledonia: Influenza activity in New Caledonia has increased significantly, with 285 cases reported, 2.4 times higher than in 2024. Acute respiratory infections (ARI) accounted for 3.2% of sentinel consultations at the end of November 2025, rising to 10% by EpiWeek 49, reaching the epidemic threshold. In November 2025, 41 cases have been recorded which is more than the historical average and also higher than the maximum already observed for this period. Testing indicates a predominance of A(H3N2) strain with a positivity rate of 59% though testing numbers remain low. Individuals over 65 and under 5 years old remain most at risk, but since early November the median age of cases is 24 years, suggesting young adults are currently most affected. Since 1st November 2025, four flu-positive cases have been hospitalised with one in intensive care. The flu is currently affecting mostly young adults. - Source: Vigiliance DASS Grippe, Affaires sanitaires et sociales, Gouvernement de La Nouvelle-Calédonie, shared with PPHSN Coordinating Body focal point on 8 December 2025.
Measles
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Canada: In Canada, for EpiWeek 48 (23 – 29 November 2025) there has been 37 new confirmed measles cases bringing the total to 5,298 cases (4,926 confirmed, 372 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 48: 23 - 29 November 2025 accessed on 9 December 2025.
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Hawaii: The Hawaiʻi Department of Health (DOH) reported a second wastewater detection of measles in West Maui County, found in samples collected on 30 November 2025, though no human measles cases have been identified. Wastewater testing, conducted through the National Wastewater Surveillance System, indicates possible presence of the virus but does not confirm active infection or community spread. DOH urges residents to stay up to date with the MMR vaccine as measles remains highly contagious, and international outbreaks continue. – Source: State of Hawaii Department of Health, DOH Reports Second Wastewater Detection Of Measles In Maui County 5 December 2025 accessed on 9 December 2025.
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New Zealand: In New Zealand (NZ), 28 confirmed measles cases have been reported, 22 of whom are no longer infectious. The recent new cases are linked to an exposure event at Auckland Airport Domestic Terminal on 17 November 2025 between 4:00am and 9:30am. Locations of interest are updated regularly. Residents are urged to monitor for symptoms and to call their healthcare provider if unwell and check their immunisation status. – Sources: New Zealand Health: Measles outbreak update - Thursday 4 December 2025 and Measles locations of interest accessed on 9 December 2025.
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United States: In the United States, the CDC reported a total of 1,828 measles cases across 43 U.S. jurisdictions as of 2 December 2025, with 87% of these cases linked to forty-six outbreaks. The majority of cases are among unvaccinated individuals (92%), and 12% of the cases have resulted in hospitalization. There have been three confirmed deaths. The 43 jurisdictions that have reported measles cases are: Alabama, Alaska, Arizona, Arkansas, California, Colorado, 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 26 November 2025, accessed on 2 December 2025.