The Centre for Health Protection (CHP) of the Department of Health today (August 8) reported the latest number of dengue fever (DF) cases. The Head of the Communicable Disease Branch of the CHP, Dr Albert Au, reminded the public that due to the increase in temperature and rainfall in summer, mosquito infestation might be aggravated in Hong Kong. In addition, members of the public will travel to DF-endemic regions more frequently during the summer holiday. Therefore, the risk of DF in Hong Kong is increasing.

     From August 1 to yesterday (August 7), the CHP recorded three imported DF cases. The patients had travelled to Cambodia, the Philippines and Thailand during the incubation periods respectively.
 
     As of yesterday, 39 imported DF cases have been recorded so far this year. A total of 161 cases of DF were recorded in 2024, including 156 imported 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 2023, over 6.5 million cases and more than 7 300 dengue-related deaths were reported in over 80 countries/territories. In 2024, the WHO recorded over 14 million cases, which was a record number.

    DF is prevalent in many neighbouring tourist destinations. Indonesia, Malaysia, Thailand and Vietnam have each recorded over 20 000 cases so far this year. Singapore has also recorded over 3 000 cases. Meanwhile, according to the Guangdong Provincial Center for Disease Control and Prevention, Guangdong Province has recorded a total of 465 locally infected cases so far this year. A total of 157 cases were recorded in the week between July 28 and August 3, with the highest number of cases recorded in Guangzhou, Yunfu, Zhongshan and Foshan.
     
     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 website.

     "There have been frequent imported cases of dengue fever in Hong Kong, as well as occasional sporadic local cases every year. The presence of Aedes albopictus in Hong Kong makes our population vulnerable. Mosquitoes breed quickly during the hot and rainy summer months. There are risks of DF outbreaks if mosquito control is inadequate. Hence, mosquito control is of paramount importance. Members of the public are advised to maintain strict environmental hygiene, mosquito control and personal protective measures both locally and when travelling outside of Hong Kong. The public is reminded that eliminating mosquito breeding sites and avoiding mosquito bites are key to preventing DF. Those returning from areas affected by DF should apply insect repellent for 14 days upon arrival in Hong Kong. If feeling unwell, they should seek medical advice promptly and provide their travel details to a doctor," Dr Au added.

     Members of the public are also reminded to take heed of the following advice on mosquito control:
 

• Thoroughly check all gully traps, roof gutters, surface channels and drains to prevent blockage;
• Scrub and clean drains and surface channels with an alkaline detergent compound at least once a week to remove any deposited mosquito eggs;
• Properly dispose of refuse, such as soft drink cans, empty bottles and boxes, in covered litter containers;
• Completely change the water of flowers and plants at least once a week. The use of saucers should be avoided if possible;
• Level irregular ground surfaces before the rainy season;
• Avoid staying in shrubby areas; and
• Take personal protective measures such as wearing light-coloured long-sleeved clothes and trousers, and apply insect repellent containing DEET to clothing or uncovered areas of the body when doing outdoor activities.

     
     ​DEET-containing insect repellents are effective and the public should take heed of the tips below:
     

• Read the label instructions carefully first;
• Apply right before entering an area with risk of mosquito bites;
• Apply on exposed skin and clothing;
• Use DEET of up to 30 per cent for pregnant women and up to 10 per cent for children (For children who travel to countries or areas where mosquito-borne diseases are endemic or epidemic and where exposure is likely, those aged 2 months or above can use DEET-containing insect repellents with a DEET concentration of up to 30 per cent);
• Apply sunscreen first, then insect repellent;
• Reapply only when needed and follow the instructions; and
• In addition to DEET, there are other insect repellents available on the market containing different active ingredients, such as IR3535, picaridin etc. When using any insect repellent, the public should follow the usage instructions and precautions on the product label.

     The public should call 1823 in case of mosquito problems and may visit the following pages for more information: the DF page of the CHP and the Travel Health Service, the latest Travel Health News, tips for using insect repellents, and the CHP Facebook Page and YouTube Channel.

Ends/Friday, August 8, 2025
Issued at HKT 18:15

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