Epidemic and emerging disease alerts in the Pacific as of 4 November 2025

Epidemic and Emerging Disease Alerts in the Pacific (as of 4 November 2025)

Published on 4 November 2025 by SPC, this report provides updates on recent disease activity across several Pacific nations since the previous map released on 28 October 2025.

American Samoa

On 8 July 2025, American Samoa declared a public health emergency due to a dengue outbreak. As of the latest update on 23 October 2025, 15 new cases were reported, raising the total to 303 laboratory-confirmed infections. Six patients are currently hospitalised, but no serious complications or dengue haemorrhagic fever have been observed.

Laboratory testing by the Hawaii State Laboratory confirmed the simultaneous presence of DENV‑1 and DENV‑2. Health authorities continue to advise the public to protect against mosquito bites, destroy breeding sites, and participate in ongoing vector control campaigns.

“The red alert for DENV‑1 and DENV‑2 remains in effect.” — American Samoa Department of Health, update of 23 October 2025 (accessed 4 November 2025)

French Polynesia

During Epidemiological Week 42, ten new confirmed dengue cases were documented. Since 27 November 2023, a cumulative total of 2,665 cases has been reported, comprising 2,384 confirmed and 281 probable infections. No hospitalisations occurred during EpiWeek 42, and the positivity rate declined compared to the previous week.

“The blue alert for DENV‑1 remains in place.” — Bulletin de surveillance sanitaire de Polynésie française n°39‑2025, shared with PPHSN Coordinating Body on 28 October 2025

Author’s Summary

This update highlights continued dengue transmission in American Samoa and French Polynesia, with stable alerts and public health measures aimed at reducing mosquito-borne infections.

ReliefWeb — 2025-11-05