Countries: World, American Samoa, Australia, Canada, Cook Islands, French Polynesia (France), Kiribati, Nauru, New Zealand, Papua New Guinea, Réunion (France), Samoa, Tonga, Tuvalu, United States of America Source: Pacific Community Please refer to the attached Map. Highlights/updates since the last map was sent on PacNet on 22 July 2025:DengueAmerican Samoa: On 8 July 2025, the American Samoa Department of Health declared a public health emergency due to a dengue fever outbreak. As of 21 July 2025, there have been a total of 12 laboratory-confirmed cases of dengue fever reported, of which ten are imported and two are locally acquired. The initial six cases were serotyped at the Hawaii State Lab, five were Dengue Virus Type 1 (DENV-1) and one was identified as Dengue Virus Type 2 (DENV-2). The public are urged to protect themselves from mosquito bites, eliminate breeding sites and allow environmental teams to conduct spraying and inspections. A red alert for DENV-1 and DENV-2 is maintained. Source: Personal exchange with country focal point and DOH Epidemiologist gives Dengue Update accessed on 29 July 2025.Cook Islands: On 22 May 2025, the Ministry of Health officially declared a dengue fever outbreak in Rarotonga. As of 23 July 2025, 73 confirmed dengue cases have been reported with 65 individuals fully recovered and 8 cases still active. Of the fifty samples with confirmed serotypes, forty-seven were Dengue Virus Type 1 (DENV-1) and three were Dengue Virus Type 2 (DENV-2), indicating co-circulation of DENV-1 and DENV-2. Clean-up campaigns and peri-focal spraying are being carried out in hot spot areas, alongside ongoing risk assessments. The public is urged to eliminate mosquito breeding sites, use repellents, wear long sleeves, and seek medical care if symptoms appear. The red alert for DENV-1 and DENV-2 is maintained. – Sources: Dengue Status Update #23 accessed on 29 July 2025.French Polynesia: In EpiWeek 29, 25 new dengue cases (20 confirmed and 5 probable) were reported. Since November 27, 2023, a total of 2,444 cases has been recorded, including 2,193 confirmed and 251 probable cases. One new hospitalisation was reported in EpiWeek 29. The positivity rate and hospitalisation rate decreased compared to EpiWeek 28. The blue alert for DENV-1 is maintained. – Source: Bulletin de surveillance sanitaire de Polynésie française n°27- 2025 shared with focal point on 29 July 2025.Kiribati: The Ministry of Health confirmed a dengue outbreak on 24 April 2025, after a significant rise in confirmed cases. As of 28 July 2025, the Health Ministry reported a total of 375 dengue confirmed cases and 972 suspected dengue cases with 65 cases admitted, of which 63 have now been discharged. Dengue cases range in age from 1 month to 95 years, with the most affected group being those aged 3 to 9 years. Among all reported cases, 53% are female and 47% male. The serotypes that are responsible for this current outbreak are Dengue Virus Type 1 (DENV-1) and Dengue Virus Type 2 (DENV-2), tested at VIDRL in Melbourne. The Ministry of Health is actively promoting health awareness on social media through posters, press releases, and videos. It continues to investigate cases, conduct house-to-house inspections in high-risk areas, eliminate mosquito breeding sites, and advise community members to maintain a clean and healthy environment. A red alert for DENV-1 and DENV-2 is maintained. – Source: Dengue Fever Situational Report #13 (28 July 2025) shared with PPHSN Coordinating Body focal point on 29 July 2025.Nauru: Dengue cases were initially reported by the Republic of Nauru (RON) Hospital on 27 June 2025. As of 24 July 2025, the Ministry of Health reported 200 dengue confirmed cases. Nearly 90% of these are children aged 1 to 14 years, with the highest concentration of cases reported from the districts of Meneng, Denigomodu (Locations settlement), and Aiwo. All districts, except Ijuw, have recorded cases. Thermal fogging, residual spraying and peri-focal spraying are being carried out in homes of confirmed cases. The public is advised to eliminate mosquito breeding sites, avoid mosquito bites and seek medical attention if symptoms appear. At this point of time, the circulating serotype is unknown. A red alert for Dengue (undetermined serotype) is added. – Sources: The Government of the Republic of Nauru accessed on 29 July 2025.Samoa: As of 28 July 2025, the Ministry of Health reported 521 lab-confirmed dengue cases in EpiWeek 30 (21 – 27 July 2025) bringing the total number of confirmed cases to 2,277 and two reported deaths since the declaration of the outbreak on 17 April 2025. The majority of cases (91%) are from Upolu Island, with 55% male and 45% female. Most cases are distributed across the Apia Urban Area and North West of Upolu regions, with individuals under 15 years old (71%) being the most affected. 12% of cases required hospitalisation, and of these admissions, 88% have been discharged. Of the 20 cases with confirmed serotypes, 85% are DENV-1 and 15% are DENV-2. The Ministry of Health continues collaboration across sectors through a whole-of-government approach via the Integrated Vector Control Committee. Current response efforts are focused on source reduction and environmental sanitation measures, ongoing risk communication on dengue preventative measures on all media outlets while urging the public to wear long-sleeved clothing to minimize risk of infection, use mosquito nets and repellents, remain vigilant for severe symptoms and to seek medical attention immediately when necessary. The red alert for DENV-1 and DENV-2 is maintained. – Source: Dengue Fever Situational Report #15 (28 July 2025) shared with PPHSN Coordinating Body focal point on 29 July 2025.Tonga: As of 25 July 2025, the Ministry of Health reported two new dengue cases, bringing the total confirmed cases to 904 since the declaration of the Outbreak on 19 February 2025, primarily affecting 10-19-year-olds. To date, three dengue-related deaths have been reported, with no patients currently hospitalised. Authorities continue case investigations, vector control at hot spot areas and public awareness efforts, urging residents to eliminate breeding sites, use protective measures, and seek medical attention for severe symptoms. The serotype that is responsible for this current outbreak is Dengue Virus Type 2 (DENV-2) identified by the Victorian Infectious Diseases Reference Laboratory (VIDRL), Melbourne Australia. Due to the decrease in number of reported new cases over the past two months, the red alert for DENV-2 is now changed to a blue alert. – Source: Dengue Fever Outbreak, Situation report #67 (25 July 2025) shared with shared with PPHSN Coordinating Body focal point on 28 July 2025.Tuvalu: The Tuvalu Department of Health declared a dengue outbreak on June 5, followed by the release of a dengue alert. As of 28 July 2025, 37 confirmed dengue cases have been reported, with eleven cases hospitalised. The circulating serotype is Dengue Virus Type 2 (DENV-2). The Ministry urges the public to take immediate precautions to prevent mosquito breeding sites and bites. These measures include eliminating standing water, using mosquito nets and repellents, wearing long-sleeved clothing, keeping surroundings clean and to seek medical attention when symptoms arise. The red alert for DENV-2 is maintained. Source: Dengue Fever Outbreak, Situation report #4 (28 July 2025) shared with shared with PPHSN Coordinating Body focal point on 29 July 2025.Pertussis/Whooping coughNew Zealand: As of week ending on 18 July, weekly pertussis cases in New Zealand increased to 33 from 27 in week ending on 11 July, bringing the total reported cases since the beginning of 2025 to 1,640. According to the latest report from the New Zealand Institute for Public Health and Forensic Science (PHF Science), 2,635 confirmed, probable and suspect cases have been notified since the start of the national epidemic on 19 October 2024. Of these, 233 cases (9.2%) have required hospitalisation with one reported death. 108 (49.1%) out of the 222 cases in infants under 1 year are hospitalised. The blue alert is maintained. – Sources: Pertussis dashboard and Pertussis Report 31 May–27 June 2025 accessed on 29 July 2025.Other Information:ChikungunyaRéunion Island: The ongoing chikungunya epidemic in Réunion Island is decreasing with the virus circulating in limited municipalities. Since the beginning of the year, 54,410 confirmed cases, 2,860 visits to the emergency room, 578 hospitalisations and 28 deaths linked to chikungunya have been reported. Recent outbreaks in Réunion, Mayotte, and Mauritius mirror the devastating 2004–2005 epidemic, with Europe now reporting local transmission as well. Health authorities are urging heightened vigilance for travellers to La Réunion, visitors are advised to take preventive measures against mosquito bites, including the use of insect repellent, wearing long-sleeved clothing, and staying in accommodations with screened windows or air conditioning. Returning travelers may pose a risk of introducing chikungunya to other regions, where Aedes mosquito vectors are present. It is recommended that returning travellers from Reunion Island monitor for symptoms (fever, joint pain, rash) for up to two weeks and seek medical attention if symptoms arise. - Source: Chikungunya à La Réunion : semaine du 14 au 20 juillet 2025 accessed on 29 July 2025.MeaslesCairns: Queensland Health has issued a measles alert for Cairns after a confirmed case visited several public locations while infectious, including Cairns Airport, Cairns Hospital, and Mad Monkeys backpackers between 23–24 July 2025. Measles is highly contagious and symptoms can appear up to three weeks after exposure, with early signs including fever, cough, and sore eyes followed by a red rash. People who may have been exposed are urged to monitor for symptoms, avoid public spaces if symptomatic, and check their vaccination status, with free MMR vaccines available through GPs and pharmacies. - Source: Measles alert for Cairns accessed on 29 July 2025.Canada: In Canada, for EpiWeek 29 (13 – 19 July 2025) there has been 230 new measles cases (212 confirmed and 185probable) bringing the total to 4,206 cases (3,878 confirmed, 328 probable) across ten jurisdictions. The jurisdictions are as follows Alberta, British Columbia, Manitoba, New Brunswick, Northwest Territories, Nova Scotia, Ontario, Prince Edward Island, Quebec, Saskatchewan. - Source: Measles and rubella weekly monitoring report accessed on 29 July 2025.Réunion Island: A case of autochthonous measles was reported in a 23-month-old child in Réunion Island on July 17, 2025, this is the first since 2019, prompting immediate public health measures including contact tracing and vaccination checks. Vaccination coverage remains insufficient, with only 80% of infants receiving the recommended two doses, below the 95% threshold needed to halt virus transmission. Measles is highly contagious and can cause serious complications, making vaccination and barrier gestures essential for prevention and protection. - Source: Appel à la vigilance face au risque de recrudescence de rougeole accessed on 29 July 2025.United States: In the United States, the CDC reported a total of 1,319 measles cases across 40 U.S. jurisdictions, as of 22 July with 87% of these cases linked to twenty-nine outbreaks. The majority of cases are among unvaccinated individuals (92%), and 13% of the cases have resulted in hospitalization. There have been three confirmed deaths. The 40 jurisdictions that have reported measles cases are as follows, Alaska, Arkansas, Arizona, California, Colorado, Florida, Georgia, Hawaii, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Missouri, Montana, Nebraska, New Jersey, New Mexico, New York City, New York State, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, and Wyoming. - Source: Measles Cases and Outbreaks accessed on 29 July 2025.