24/04/2026
Health Information on Dengue Fever
The Centre for Health Protection (CHP) of the Department of Health is investigating the first local case of dengue fever (DF) in Hong Kong this year, and is working with various government departments to implement appropriate prevention and control measures.
The CHP reminds that as temperatures gradually rise and humidity increases, creating favourable conditions for mosquito breeding, members of the public should 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.
Members of the public may use DEET-containing insect repellents or other effective active ingredients properly to prevent mosquito bites, while the following precautions should be taken when using them:
· read the label instructions carefully first;
· apply right before entering an area with a 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 and picaridin. When using any insect repellent, the public should follow the usage instructions and precautions on the product label.
Furthermore, members of the public are remined to take the following advice on mosquito control:
· Inspect your residence, workplaces and surroundings to remove potential breeding grounds;
· 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; and
· Install mosquito screens on windows and doors if necessary, or use mosquito screens or nets in indoor areas.
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 page, Instagram Account and YouTube Channel, and also the Mosquito Prevention and Control dedicated page of the FEHD.
Department of Health
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敬啟者：
有關登革熱的健康資訊
衞生署衞生防護中心（中心）正調查本港今年首宗本地登革熱個案，並正聯同政府多個部門採取適當防控措施。
中心提醒市民，隨着氣溫逐漸回升及濕度增加，有利蚊子生長和繁殖，市民應採取措施防止蚊子滋生。此外，不論身處本港或前往受蚊傳疾病影響的地區，市民均應採取適當防蚊措施，避免被蚊叮咬，以預防感染蚊傳疾病。
市民可使用含避蚊胺或其他有效活性成分的昆蟲驅避劑可有效防蚊，而使用時應注意以下事項：
• 先仔細閱讀標籤說明；
• 在進入可能被蚊叮的範圍前使用；
• 塗在外露皮膚及衣服；
• 孕婦使用避蚊胺的濃度上限是30%，兒童則為10%（如前往蚊傳疾病流行的國家或地區而有機會被蚊叮咬，兩個月或以上的兒童可使用濃度上限為30%的避蚊胺）；
• 先塗防曬霜，再塗昆蟲驅避劑；
• 遵照標籤說明，只於有需要時重複使用；及
• 除了避蚊胺之外，市面上亦有含其他活性成分的昆蟲驅避劑，例如IR3535、埃卡瑞丁（亦稱派卡瑞丁）等。公眾使用任何昆蟲驅避劑時，應遵從產品標籤上的使用說明及注意事項。
此外，市民應繼續採取以下措施預防蚊患：
· 視察住所、工作間及附近環境、徹底清除可供蚊子滋生的地方；
· 徹底檢查集水溝氣隔、屋頂雨水槽、明渠及排水渠，避免淤塞；
· 每星期至少一次以鹼性清潔劑擦洗溝渠和排水明渠，以除去可能積聚的蚊卵；
· 汽水罐、空樽及空盒等垃圾應妥善棄置在有蓋的垃圾桶內；
· 栽種花卉的水應每星期最少徹底更換一次，盡量避免使用墊碟；
· 在雨季前把凹凸不平的地面填平；及
· 如有需要，可於門窗裝上防蚊網，或在室內地方使用隔蚊簾或蚊帳。
市民如發現蚊患，應致電1823，亦可參閱以下專題網頁，了解詳情：衞生防護中心及旅遊健康服務登革熱專頁、最新旅遊情報、使用昆蟲驅避劑的注意事項、中心Facebook專頁、Instagram帳戶及YouTube頻道，以及食環署防控蚊患專頁。
衞生署
