Update on mosquito-borne diseases, dengue fever and chikungunya fever
The Centre for Health Protection (CHP) of the Department of Health today (June 5) announced the latest situation regarding dengue fever (DF) and chikungunya fever (CF). As temperatures rise and humidity increases, creating favourable conditions for mosquito breeding, members of the public are reminded to take appropriate measures to prevent mosquito bites and mosquito breeding, both in Hong Kong and when travelling to areas affected by mosquito-borne diseases, in order to prevent mosquito-borne diseases.
Dengue fever
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From May 29 to yesterday (June 4), the CHP recorded two imported DF cases, including one local DF case announced earlier, and an imported case in which the patient had travelled to Indonesia during the incubation period.
Regarding the local DF case announced earlier, as of noon today, the CHP had assessed over 1 600 residents through a health consultation booth at the Neighbour Care · Buildings Support Center (address: 165 Tai Nan Street, Sham Shui Po), an enquiry hotline, and questionnaire surveys. So far, the CHP has not received any notification of suspected cases epidemiologically linked to that local case. The CHP continues to urge individuals in the vicinity of Ki Lung Street in Sham Shui Po to call the enquiry hotline (tel: 2125 2373, operating from 9am to 6pm) if relevant symptoms develop, and seek medical attention if needed. The CHP and relevant departments’ investigations and follow-up are still ongoing.
Hong Kong has recorded 22 DF cases so far this year, comprising 20 imported cases and two local cases. A total of 59 DF cases were recorded last year (2025), all of which were imported cases. In 2024, 161 DF cases were recorded, comprising 156 imported cases and five local cases.
According to the World Health Organization (WHO), the global incidence of DF has markedly increased over the past two decades, posing a substantial public health challenge. In 2024, the WHO recorded over 14 million cases, which was a record number. From January to July 2025, over 4 million cases and over 3 000 DF-related deaths were reported in 97 countries/territories.
DF is prevalent in many neighbouring tourist destinations. In 2025, Indonesia, India and Vietnam each recorded over 120 000 cases; Malaysia and Thailand each recorded over 50 000 cases; and Singapore recorded over 4 000 cases. Meanwhile, as of May 10, the Guangdong Provincial Center for Disease Control and Prevention had recorded 97 cases in Guangdong Province this year, including eight locally infected cases. Guangdong Province recorded over 3 500 locally infected cases in 2025.
Detailed information on the latest DF situation in Hong Kong, as well as neighbouring and overseas countries and areas, has been uploaded to the CHP'swebsite.
Chikungunya fever
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From May 29 to yesterday, no new cases of CF had been recorded. Hong Kong has recorded two confirmed CF cases so far this year, both of which were imported cases. Hong Kong recorded a total of 82 confirmed CF cases last year. Among them, 11 were local cases and the rest were imported cases.
Last year, a total of 502 264 CF cases and 186 CF-related deaths were reported in 41 countries/territories. Cases have been reported in the Americas, Africa, Asia and Europe. Meanwhile, as of May 10, the Guangdong Provincial Center for Disease Control and Prevention had recorded four cases in Guangdong Province this year, including one locally infected case.
Preventive measures to be taken by the public
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According to the Food and Environmental Hygiene Department (FEHD), as compared with last year, the temperature began to climb earlier this year and the rainfall in April and May increased substantially, creating favourable conditions for mosquito growth and breeding. As a result, the rise in gravidtrap indexes occurred earlier this year. Depending on factors like rainfall, the indexes may rise further but the overall trend of gravidtrap indexes this year is similar to those of previous years.
Therefore, the CHP reminds members of the public to maintain good environmental hygiene, and to take appropriate measures to prevent mosquito bites and mosquito breeding, both in Hong Kong and when travelling to areas affected by mosquito-borne diseases, in order to prevent mosquito-borne diseases. Mosquito-borne diseases such as DF and CF are endemic in various countries worldwide. The risk of importation persists. Members of the public should check the situation at their destinations before travelling abroad, especially when travelling to Southeast Asian countries. Additionally, whether travelling or not, members of the public should use DEET-containing insect repellents or other effective active ingredients properly to prevent mosquito bites, but the following precautions should be taken when using them:
The FEHD also appeals to members of the public to continue to stay alert and work together to carry out mosquito prevention and control measures early, including inspecting their homes and surroundings to remove potential breeding grounds, changing water in vases and scrubbing their inner surfaces, removing water in saucers under potted plants at least once a week, and properly disposing of containers such as empty cans and lunch boxes. The FEHD also advises members of the public and property management agencies to keep drains free of blockage and level all defective ground surfaces to prevent the accumulation of water. They should also scrub all drains and surface sewers with an alkaline detergent at least once a week to remove any mosquito eggs.
The public should call 1823 in case of mosquito problems, and may visit the following pages for more information: the CF page of theCHPand theTravel Health Service, the latestTravel Health News,tips for using insect repellents, and the CHPFacebook Page,Instagram AccountandYouTube Channel, and also theMosquito Prevention and Control dedicated pageof the FEHD.
Source: AI-found images
