Attachments
Highlights/updates since the last map was sent on PacNet on 27 January 2026:
Dengue
- Cook Islands: Cook Islands continue to experience dengue activity, with a total of 562 probable and confirmed cases reported since the outbreak began in May 2025, including 31 hospitalizations but no deaths. As of 23 January 2026, 89 cases remain active while 473 have recovered, with ongoing testing and surveillance across all islands. Public‑health responses include targeted vector control in hotspots, community awareness campaigns, and readiness to implement border measures for domestic flights as needed. The blue alert for DENV-1 and DENV-2 remains in effect. – Source: Cook Islands 2025 Dengue Outbreak Situation Report #78 (23 January 2026) shared with PPHSN Coordinating Body focal point on 03 February 2026.
Influenza
- French Polynesia: The influenza outbreak in French Polynesia has come to an end, with indicators decreasing for several consecutive weeks. In Epiweek 04 (19 – 25 January 2026), seven influenza A cases were reported including one hospitalization and one additional death, bringing the epidemic’s total to 13 deaths since Epiweek 47 of 2025. The majority of recent cases were caused by influenza A(H3N2), and overall surveillance confirms the decline of this epidemic wave. The blue alert for Influenza A is now removed. – Source: Bulletin de surveillance sanitaire de Polynésie française n°4 - 2026 shared with PPHSN Coordinating Body focal point on 03 February 2026.
- Wallis and Futuna: In Futuna, influenza-like illness (ILI) activity during EpiWeek 04 (19–25 January 2026) remains elevated, with syndromic and non-specific indicators close to or slightly above established thresholds. However, overall trends appear stable with no sharp increase observed, and influenza A detections continue at a low level (2 cases). In Wallis, consultations and urgent care visits stay below seasonal thresholds, syndromic indicators show no major surge, and no influenza A detections were reported. Overall, both islands show no strong epidemic growth, with Futuna maintaining modest but persistent ILI circulation and Wallis remaining largely within seasonal norms. The blue alert for Influenza A remains in effect. – Source: Tableau de bord de la surveillance multi source - ADSWF accessed on 03 February 2027.
- Federated States of Micronesia: Yap EpiNet team declared an influenza‑like illness (ILI) outbreak on 08 December 2025 after detecting a surge in the outer islands. With three new ILI cases reported (between the 23 of January – 27 of January 2026),this brings the cumulative total since 16 November 2025 to 941 cases as of 27 January 2026. . The laboratory has confirmed 58 influenza A cases, including two subtyped as A(H3), along with 3 respiratory syncytial virus (RSV) infections, with the 0–4-year age group remaining the most affected. Due to the significant decrease in ILI encounters and two consecutive weeks below threshold, the EpiNet team declared an “all clear” for influenza on 26 January 2026. The blue alert for Influenza A in Yap State is now removed. – Sources: Yap State Department of Health Services, Situational Report No. 20 (27 January 2026) shared with PPHSN Coordinating Body focal point on 27 January 2026.
Influenza-like illness
- Republic of Marshall Islands: Influenza‑like illness (ILI) activity in the Republic of the Marshall Islands declined further in EpiWeek 04 (19– 25 January 2026), with Majuro, Ebeye, and several neighbouring islands all reporting decreasing case numbers compared to earlier weeks. Despite this downward trend, ILI remained above alert thresholds in several outer‑island communities, where localized clusters continued to exceed population‑based triggers. Overall, patterns indicate ongoing but easing transmission nationally, with the highest activity still concentrated in select outer‑island sites. The aetiology is yet to be determined thus a grey alert for ILI remains in effect. – Source: RMI Communicable Disease Weekly Report for EpiWeek 04 (19 – 25 January 2026) shared with PPHSN Coordinating Body Focal point on 29 January 2026.
Measles
- Australia: Australia continues to record imported measles cases across multiple jurisdictions, with Victoria reporting three new travel‑associated cases on 02 February, bringing its January 2026 total to four. New South Wales has issued repeated alerts, most recently on 30 January, after an infectious traveller returned from South‑East Asia, contributing to 14 cases since December 2025. Queensland has reported seven measles cases in 2026, including three imported and four locally acquired cases epidemiologically linked to an imported case. Nationally, measles activity reflects continued importation risk. The red alert for measles in Australia remains in effect. – Sources: New measles cases in Victoria | health.vic.gov.au, Measles alert for Sydney, Notifiable conditions reports: Summary information | Queensland Health and National Communicable Diseases Surveillance Dashboard accessed on 03 February 2026.
Pertussis/Whooping cough
- New Zealand: As of the week ending on 23 January 2026, weekly pertussis cases in New Zealand decreased to 57 cases as compared to 73 in previous week ending on 16 January, bringing the total reported cases since the beginning of 2026 to 189. According to the latest report from the New Zealand Institute for Public Health and Forensic Science (PHF Science), 3,861 confirmed, probable and suspected cases have been notified since the start of the national epidemic on 19 October 2024. Of these, 341 cases (9.2%) have required hospitalisation with one reported death. Out of the 323 cases in infants under 1 year, 164 (51.3%) have been hospitalised. The blue alert for pertussis remains in effect. – Sources: Pertussis dashboard and Pertussis report 13 December–9 January 2026 accessed on 03 February 2026.
Other Information:
Dengue
- Chuuk: As of 21 January 2026, 12 out of 51 patients screened since 05 December 2025 tested positive for dengue (23.5%). Between 12 and 21 January, three new outpatient cases were confirmed positive for dengue. The reported cases are from Satowan, Nepukos, and Sapuk. Samples from confirmed cases have been collected and sent overseas for serotyping. Source: CHUUK DENGUE SITREP03 accessed from Yap State Communicable Disease report Week 4 shared with PPHSN Coordinating Body Focal point on 26 January 2026.
- New Caledonia: In New Caledonia between 01– 03 February 2026, one imported dengue DENV-1 case from Tahiti and 36 confirmed local cases (plus four probable) across 13 municipalities were reported, all identified as DENV-1. New Caledonia has not experienced a major arbovirus epidemic since 2019, the year that marked the beginning of Wolbachia‑carrying mosquito releases in Nouméa. Despite this progress, the recent occurrence of autochthonous dengue cases during the hot and rainy season underscores the need for heightened vigilance. In 2025, 13 imported dengue cases were confirmed originating from Tahiti, Bali, Indonesia, and Tonga of which seven were DENV-1, one was DENV-2, and five were not subtyped; additionally, nine local cases were confirmed, most of which were type 1. Source: Personal communication with New Caledonia focal point on 03 February 2026 La dengue, le chikungunya et le Zika | Direction des Affaires Sanitaires et Sociales de Nouvelle-Calédonie accessed on 03 February 2026.
- New Zealand: In New Zealand (NZ), during surveillance week 04 of 2026 (24 – 30 January), 22 confirmed imported dengue cases and one case under investigation were reported. Among those with travel history, 71% had returned from the Cook Islands, 24% from Samoa, and 5% from Indonesia. Given the known serological cross‑reactivity between dengue and other flaviviruses, some reported dengue cases may ultimately be reclassified as other flavivirus infections as epidemiological and laboratory investigations continue. Source: NZ Arbovirus Notifications by Country (04: 24/01/2026–30/01/2026) shared with PPHSN Coordinating Body Focal point on 02 February 2026.
Pertussis
- Federated States of Micronesia: As of 30 January 2026, four pertussis cases have been identified in Pohnpei, including three laboratory‑confirmed cases and one epidemiologically linked case, with three cases occurring within a single household. The affected individuals are all adults, with ages ranging from 21 to 47 years old. None of the cases reported recent travel. Public health authorities have intensified surveillance, contact tracing, and community awareness efforts while promoting DTaP/Tdap vaccination across all clinics and municipalities. Source: Pohnpei State Department of Health and Social Services – Pertussis SitRep 1 2026 shared with PPHSN Coordinating Body Focal point on 03 February 2026.
Many thanks again for your continuous contributions. Please note that the alerts displayed on the map are based on information available to us as of the date of this report.