第8版，《世界卫生组织卫生紧急情况方案流行病学公报》，世界卫生组织东南亚区域办事处，2026年4月22日。报告期：2026年4月6日至19日

WHO Health Emergencies ProgrammeWHO Regional Office for South-East Asia8thedition(2026),22April2026Reportingperiod:06to19April2026 Thisepidemiological bulletin aims to providethe situation of key infectiousdiseases intheWHOSouth-East AsiaRegionto inform risk assessmentsand responses. The bulletin usesinformation from publicly availablesources and Key events and updates.......................................................................................................................2 Bangladesh: Measles..............................................................................................................................................2Maldives: Dengue...................................................................................................................................................4Sri Lanka: Cyclone Ditwah......................................................................................................................................5New publication: Global publichealth intelligence report 2024............................................................................6New publication: Indicators for Human Exposures to Zoonotic Pathogens—WHO & PREZODE (2025)..............6Influenza..............................................................................................................................................7Situation in the WHO South-East Asia Region........................................................................................................7COVID-19.............................................................................................................................................9Situation in the WHO South-East Asia Region........................................................................................................9mpox.................................................................................................................................................11Situation in the WHO South-East Asia Region......................................................................................................11Dengue..............................................................................................................................................13 Key events and updates Bangladesh:Measles Situationoverviewas of20April 2026 •Since 15 March 2026and as of20April: •Since the launch of themeasles-rubella(MR)vaccination campaignon 5 Apriland as of 20 April,a total of 1 595855 children have been vaccinated, equivalent to 73.2% of the overall campaign target population. oIn Dhaka division, which hasreported the highest cumulative numbers of suspected and laboratory-confirmed measles cases, 666 673 children were vaccinated, representing 60.1% of the division’s overall Public Health Response •The Government ofBangladesh launched a nationwidemeasles-rubella(MR)vaccination campaign on 20 April2026 followingthe rapid rollout of the initial emergency vaccination efforts in thehardest-hit areas. oThe campaign aims to provide a free MR vaccine dose to all children aged 6–59 months to rapidly reduceoutbreak risk among the most vulnerable age group.oDelivery is being implemented through routine EPI sites, with additional strategies including eveningsessions in cities, outreach to preschools and madrasas, vaccination in hard-to-reach areas and transport •Vitamin A supplementation is provided to all suspected and confirmed measles cases as an essential componentof standard treatment and case management.•District Rapid Response Teams (RRTs) have been activated.•Vaccine procurementisfast-tracked by the Ministry of Health.•Hospitalpreparedness is enhanced,includingstrengtheningofisolation capacity, and reinforcing infectionprevention and control measures. Maldives:Dengue Situation as on 15 April 2026 •As of 15 April 2026, a total of 1 908 dengue cases and 3 deaths have been reported in the Maldives in 2026. Ofthese, 349 cases were reported from Male’and 1 559 from the atolls.•The number of dengue cases has remained consistently above the established baseline sincearound October2025 and is higher compared to the same period in previous years.•An increase in dengue cases has been observed across allAtolls.TheAtollsreporting the highest number of Public Health Response •Vector controlguidance has been shared with the islands reporting the highest number of cases.•Cleaning activities were carried out in the islands reporting the highest number of cases.•Home visits are conducted by Islands reporting the highest numbers•Awareness messages are being disseminated through all official social media ofHealth Protection Agency (HPA)of Maldivesaswell as though media appearances.•Virtual sessionswereconducted on clinical management, strengthen reporting and enhance controlmeasures. Sri Lanka:CycloneDitwah Situationas of7 April2026 •Since28 November 2025,more than 2.2 million peoplehave beenaffectedby Cyclone Ditwah, and an estimated1.2 milli