# Vietnam dengue fever outbreaks expand across provinces > Live situation record from CLSTR: https://clstr.news/situations/ho-chi-minh-city-public-health-developments > Updated: 2026-09-11T11:30:00.000Z. Sources: 30. Developments: 18. By mid-September 2026, dengue fever outbreaks continued to expand across Vietnam, driven by hot, humid weather and the rainy season. In Ho Chi Minh City, the situation remains severe, with over 31,000 cases recorded since the beginning of the year. Medical facilities, including the Hospital for Tropical Diseases, have treated critical cases involving shock, multi-organ failure, and respiratory distress, sometimes requiring expensive interventions such as VV-ECMO. In Dak Lak province, the Center for Disease Control reported 6,112 cases as of September 10, including two deaths. High-risk areas include several communes and wards within the province. This follows a period of rapid growth in the region, which previously saw a “207% increase compared to July” in August. In Hanoi, health authorities continue to warn of potential outbreaks due to unpredictable weather, high population density, and students returning for the new school year. Regional case counts also remain elevated in Dong Nai, which has recorded more than 9,000 cases and five deaths this year. Medical experts emphasize that there is no specific treatment for dengue fever. They warn that the disease can progress to a severe stage between the third and seventh day of symptoms. Vulnerable groups—including children, the elderly, pregnant women, and individuals with underlying conditions like type 2 diabetes—face higher risks of complications such as liver damage, respiratory failure, and coagulation disorders. ## Claims - Hanoi recorded 146 dengue fever cases in the week of 17‑24 July 2026, an increase of 50 from the previous week. (corroborated by 3 sources) - Health officials warned that dengue cases typically rise each summer and expect further increases in August and September as schools reopen and travel intensifies. (corroborated by 3 sources) - Three new dengue clusters were identified in Chương Dương, Thanh Oai and Việt Hưng. (corroborated by 2 sources) - Cumulative dengue cases in Hanoi since the start of 2026 reached 871, up from 475 in the same period of 2025. (corroborated by 2 sources) - Hanoi logged 185 COVID‑19 cases in the week of 17‑24 July 2026, bringing the year‑to‑date total to 588, with no deaths reported. (corroborated by 2 sources) - Hand‑foot‑mouth disease cases in Hanoi were 109 in the week, a decrease of 15 from the prior week, with a cumulative total of 4,184 for 2026, up from 3,293 in 2025. (corroborated by 2 sources) - During the week, Hanoi reported 14 measles, 7 chickenpox and 1 adult varicella cases. (corroborated by 2 sources) - No new animal rabies outbreaks were recorded in the week, though eight rabies cases in dogs have been reported earlier in the year across several wards. (corroborated by 2 sources) ## Timeline ### 2026-09-11: Dengue fever outbreaks surge across Vietnam Dengue fever is spreading rapidly across Vietnam, with rising case numbers and fatalities reported in Ho Chi Minh City, Dak Lak, and other provinces due to favorable weather for mosquito breeding. 4 sources. https://clstr.news/cluster/dengue-fever-outbreaks-surge-across-vietnam ### 2026-09-08: Vietnam patients face critical dengue complications and high medical costs Two young patients in Vietnam are in critical condition due to dengue fever complications, requiring expensive ECMO life support and facing multi-organ failure. 4 sources. https://clstr.news/cluster/vietnam-patients-face-critical-dengue-complications-and-high-medical-costs ### 2026-09-08: Dak Lak reports 200% surge in dengue fever cases Dengue fever cases in Dak Lak, Vietnam, rose by over 200% in August. Since the start of the year, the province has recorded 5,700 cases and 252 outbreaks, with several areas identified as high-risk. 2 sources. https://clstr.news/cluster/dak-lak-reports-200-surge-in-dengue-fever-cases ### 2026-09-03: Dengue fever complications prompt medical warnings in Vietnam Medical experts in Vietnam warn of severe dengue fever complications following critical cases involving blood concentration, organ damage, and shock in both adults and children. 4 sources. https://clstr.news/cluster/dengue-fever-complications-prompt-medical-warnings-in-vietnam ### 2026-08-31: Ha Tinh health officials warn of dengue fever outbreak Ha Tinh health officials warn of a dengue fever outbreak following 221 recorded cases and announce new leadership at the Ha Tinh Traditional Medicine Hospital. 2 sources. https://clstr.news/cluster/ha-tinh-health-officials-warn-of-dengue-fever-outbreak ### 2026-08-28: Ho Chi Minh City reports 10% weekly rise in dengue fever cases Ho Chi Minh City reports a 10.5% weekly increase in dengue fever cases, totaling 28,270 since the start of the year, alongside stable but present levels of hand, foot, and mouth disease. 2 sources. https://clstr.news/cluster/ho-chi-minh-city-reports-10-weekly-rise-in-dengue-fever-cases ### 2026-08-22: Vietnam health authorities warn of rising infectious disease cases Health officials in Vietnam report rising cases of dengue fever in Hanoi and warn of increased risks for diarrhea, conjunctivitis, and meningococcal disease due to seasonal weather and environmental factors. 3 sources. https://clstr.news/cluster/vietnam-health-authorities-warn-of-rising-infectious-disease-cases ### 2026-08-17: Vietnam intensifies dengue fever prevention amid rising cases Health officials in Vietnam are ramping up dengue fever prevention in Hanoi and Dak Lak following a surge in cases and localized outbreaks driven by favorable weather for mosquito breeding. 2 sources. https://clstr.news/cluster/vietnam-intensifies-dengue-fever-prevention-amid-rising-cases ### 2026-08-06: Dengue cases surge among children in Ho Chi Minh City as rainy season approaches Dengue cases among children are rising in Ho Chi Minh City, with 30 patients treated and several severe cases, as the rainy season heightens outbreak risk. 2 sources. https://clstr.news/cluster/dengue-cases-surge-among-children-in-ho-chi-minh-city-as-rainy-season-approaches ### 2026-08-03: Hanoi reports rise in COVID-19 and dengue cases Hanoi CDC reported 268 COVID‑19 and 175 dengue cases in late July, with year‑to‑date totals of 855 and 1,046 respectively, and warned of further rises as schools reopen. 2 sources. https://clstr.news/cluster/hanoi-reports-rise-in-covid-19-and-dengue-cases ### 2026-07-29: Hanoi dengue outbreak surges to 870 cases as new hotspots emerge Hanoi's dengue cases have risen to 871, with 146 new infections reported in a week and three fresh hotspots, prompting intensified control efforts and public warnings. 8 sources. https://clstr.news/cluster/hanoi-dengue-outbreak-surges-to-870-cases-as-new-hotspots-emerge ### 2026-07-27: Dengue Cases Surge in Ho Chi Minh City as Hospitalizations Double Dengue hospitalizations in Ho Chi Minh City have doubled, with severe cases and co‑infections rising; health officials stress proper fever management, hydration, and monitoring for danger signs. 2 sources. https://clstr.news/cluster/dengue-cases-surge-in-ho-chi-minh-city-as-hospitalizations-double ### 2026-07-27: Hanoi reports surge in dengue fever cases and rise in COVID‑19 infections Hanoi recorded 146 dengue cases (up 50), three new clusters, 185 COVID‑19 cases and 109 hand‑foot‑mouth cases in one week, with authorities warning of further summer rises. 7 sources. https://clstr.news/cluster/hanoi-reports-surge-in-dengue-fever-cases-and-rise-in-covid19-infections ### 2026-07-20: Hanoi reports surge in dengue and hand‑foot‑mouth disease cases Hanoi's CDC reports 96 dengue cases and 124 hand‑foot‑mouth disease cases in one week, with new clusters and rising totals, prompting heightened public health alerts. 2 sources. https://clstr.news/cluster/hanoi-reports-surge-in-dengue-and-handfootmouth-disease-cases ### 2026-07-18: Dengue surge hits children in Ho Chi Minh City, hospitals warn of severe complications Dengue cases among children in Ho Chi Minh City have jumped, with 40 hospitalized and 10% severe; doctors warn of rapid deterioration, neurological signs, and the need for prompt treatment. 3 sources. https://clstr.news/cluster/dengue-surge-hits-children-in-ho-chi-minh-city-hospitals-warn-of-severe-complications ### 2026-07-02: Vietnam health officials tackle rising dengue cases and cardiac disease Vietnam health officials report a 30% rise in dengue cases in Ho Chi Minh City, impose fines for violations, note growing cardiac disease among youth, and announce new insurance coverage and digital record roll 3 sources. https://clstr.news/cluster/vietnam-health-officials-tackle-rising-dengue-cases-and-cardiac-disease ### 2026-06-10: Vietnam faces unprecedented dengue surge with over 50,000 cases in five months Vietnam's dengue outbreak hits over 50,000 cases in the first five months of 2026, affecting all ages, driven by DENV‑2 and climate factors, prompting expanded mosquito control and vaccine trials. 4 sources. https://clstr.news/cluster/vietnam-faces-unprecedented-dengue-surge-with-over-50000-cases-in-five-months ### 2026-06-06: Ho Chi Minh City reports 64% surge in dengue cases, over 17,700 infections Ho Chi Minh City sees a 64% rise in dengue, reporting 17,718 cases as of May 31; adults now account for over half the infections, prompting health warnings and household mosquito‑control measures. 3 sources. https://clstr.news/cluster/ho-chi-minh-city-reports-64-surge-in-dengue-cases-over-17700-infections --- Cite as: Vietnam dengue fever outbreaks expand across provinces. CLSTR, https://clstr.news/situations/ho-chi-minh-city-public-health-developments