The Pacific region, with its diverse island nations, is currently navigating a complex landscape of public health challenges, as several infectious diseases continue to pose threats. Health authorities are diligently tracking outbreaks of dengue fever, measles, whooping cough (pertussis), and rotavirus, alongside other concerns like ciguatera fish poisoning. These ongoing alerts highlight the critical need for robust surveillance, rapid response, and community-wide prevention efforts to safeguard public health across these vulnerable island communities. ## Understanding Dengue Fever: A Persistent Threat Dengue fever, a viral infection transmitted by *Aedes* mosquitoes, remains a significant public health concern throughout the Pacific. Symptoms typically include high fever, severe headache, pain behind the eyes, muscle and joint pain, and a rash. While most cases are mild, severe dengue can lead to life-threatening complications. The tropical climate of the Pacific Islands provides an ideal breeding ground for these mosquitoes, and frequent travel between islands and internationally contributes to the spread of different dengue virus types (serotypes). As of late April 2026, the **Cook Islands** are reporting low dengue activity, with only isolated cases on Rarotonga and none recently from other islands, moving towards a potential dengue-free status. However, a blue alert for DENV-1 and DENV-2 persists, indicating ongoing vigilance. In contrast, **New Caledonia** is experiencing an ongoing epidemic, with over a thousand cases reported this year, predominantly DENV-1, and remains under a red alert. **Samoa** also continues to see significant dengue transmission, with DENV-1 and DENV-2 co-circulating, particularly affecting children under 15, and is under a blue alert despite an increase in new confirmed cases. **Tonga** declared an outbreak earlier in April, with ongoing transmission, primarily DENV-2, and is under a red alert, with most cases affecting children aged 11–14 on Tongatapu. Beyond these immediate outbreaks, **New Zealand** has reported several imported dengue cases from Samoa, Cook Islands, Tonga, and Malaysia, underscoring the regional interconnectedness. Notably, **Wallis and Futuna** confirmed its first locally acquired case in Futuna, signaling indigenous circulation of the virus and prompting enhanced surveillance and vector control measures. Public health messages emphasize mosquito bite prevention, such as using repellents, wearing protective clothing, and eliminating standing water around homes. ## The Resurgence of Measles: A Call for Vaccination Measles is a highly contagious viral disease that spreads through the air when an infected person coughs or sneezes. It causes a characteristic rash, fever, cough, runny nose, and red, watery eyes. While often considered a childhood illness, measles can lead to severe complications, including pneumonia, encephalitis, and even death, especially in unvaccinated individuals or those with weakened immune systems. The measles-mumps-rubella (MMR) vaccine is highly effective in preventing the disease. **Australia** continues to report measles cases, primarily linked to international travel and subsequent local spread, particularly in New South Wales and Victoria. A red alert remains in effect, with health authorities stressing the importance of the two-dose MMR vaccine, especially for travelers. The global context is also significant, with widespread and intense measles transmission in **Bangladesh** (over 19,000 suspected cases and nearly 3,000 confirmed cases in one month) and increasing activity in **Japan**, both contributing to the risk of imported cases in the Pacific. **New Zealand** recently identified a new locally acquired measles case in Wellington with no clear link to international travel, prompting contact tracing and public exposure warnings. This highlights that even countries with relatively high vaccination rates must remain vigilant. High vaccination coverage, early detection, and rapid public health responses are crucial to prevent widespread outbreaks. ## Battling Whooping Cough (Pertussis): Protecting Our Youngest Pertussis, commonly known as whooping cough, is a highly contagious bacterial infection of the respiratory tract. It’s characterized by severe, uncontrolled coughing fits, often followed by a distinctive “whooping” sound as the person tries to inhale. While it can affect people of all ages, it is particularly dangerous for infants and young children, sometimes leading to hospitalization, pneumonia, brain damage, or death. Vaccination (DTaP for children, Tdap for adolescents and adults) is the best protection. In the **Federated States of Micronesia**, specifically Pohnpei State, pertussis transmission is ongoing, with 36 cumulative cases reported since January 2026. Unvaccinated individuals, including children, are disproportionately affected, prompting health authorities to conduct enhanced surveillance, contact tracing, and vaccination activities under a blue alert. **Guam** also continues to experience pertussis transmission, with 20 cases since late 2025 and 11 confirmed this year, leading to a red alert. Efforts focus on vaccinating infants, pregnant women, and close contacts. **New Zealand** is seeing ongoing community transmission, with weekly fluctuations in reported cases, totaling 571 cases in 2026, under a blue alert. Meanwhile, **Vanuatu** reports a declining trend in pertussis cases since a peak in late 2025, but transmission remains ongoing, with 827 cumulative cases and seven deaths, primarily affecting children under 10. A blue alert remains in effect, with surveillance continuing to ensure full control of the outbreak. ## Addressing Rotavirus and Ciguatera: Varied Health Threats Rotavirus is a common cause of severe diarrheal disease in infants and young children worldwide. It causes vomiting, watery diarrhea, fever, and abdominal pain, leading to dehydration. While a vaccine is available, outbreaks can still occur in settings with low vaccination coverage or poor sanitation. **Kiribati** has been dealing with a rotavirus outbreak, with over 6,200 cumulative cases nationwide. Although the outbreak peaked in early March and cases have been declining, low-level transmission continues, mainly affecting South Tarawa and children under five, with hospitalizations and several deaths reported. The alert level has been downgraded from red to blue, indicating continued but less intense concern. Prevention strategies focus on vaccination, improved hygiene, and safe water and food practices. Beyond infectious diseases, **Vanuatu** is also grappling with an ongoing increase in ciguatera fish poisoning. This illness is caused by eating reef fish contaminated with toxins produced by certain microalgae. Symptoms can range from gastrointestinal issues to neurological and cardiovascular problems, sometimes lasting for months. With 112 cumulative cases reported this year, mainly in males aged 15-34 and predominantly on Efate, authorities are monitoring trends closely. While no deaths or hospitalizations have been reported, public awareness about safe fish consumption is vital. ## Strengthening Regional Health Security These disease alerts underscore the dynamic nature of health challenges in the Pacific. The region’s public health system, supported by organizations like the Pacific Community (SPC) and the World Health Organization (WHO), relies heavily on robust surveillance networks, such as the Pacific Public Health Surveillance Network (PPHSN). This network facilitates information sharing and coordinated responses to outbreaks. Sustained efforts in vaccination programs, vector control, hygiene promotion, and access to timely medical care are fundamental pillars in protecting the health and well-being of Pacific communities against current and future health threats. Individual actions, like staying updated on health advisories, maintaining good hygiene, and ensuring timely vaccinations, collectively contribute to stronger regional health security. Ongoing global travel and climate change further complicate disease control, making regional and international collaboration more crucial than ever. The resilience of Pacific communities in facing these health challenges is built upon strong public health infrastructure, informed citizens, and proactive government measures.