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Chikungunya Fever is a mosquito-borne infectious disease. Caused by the Chikungunya virus (CHIKV), the disease is characterised by fever and joint pain, though it could be mildly symptomatic and self-limiting.

Globally, over 180,000 cases were reported in the first 3 quarters of 2025. Major outbreaks have occurred in countries in Southeast Asia, Africa, South America and even in Europe.

In Hong Kong, CHIKV infections are largely results of importation. In 2025, 53 imported cases have been reported through 4 November, 44 with travel history in Chinese Mainland (blue circle on the inset map) where a major outbreak involving over 15,000 people has been reported since July 2025.

In October and early November, 3 patients without travel history were reported in Hong Kong, signifying the emergence of local transmission in the territory. The first two local cases (red circles labelled local 1 and local 2 on map) were epidemiologically linked, sharing the activity areas within the flight range of Aedes albopictus. The distribution of the imported (resident locations of reported imported cases in October in black circles) and local CHIKV infection cases is widespread, bearing no specific relationship with mosquito burden indicated by the Gravitrap Index (distribution of Aedes albopictus in 4 levels, with level 1 for being non-extensive and level 2 for fairly extensive on the map).

The main precautionary measures for CHIKV infection focus on the mosquito (Aedes albopictus in Hong Kong) vector: prevention of accumulation of stagnant water in the environment, and individual protection with use of insect repellents.

Data for the map were extracted from website of Centre for Health Protection, The Government of the Hong Kong Special Administrative Region.

基孔肯雅熱是一種蚊媒傳染病。此病由基孔肯雅病毒（CHIKV）引起，其特徵是發燒和關節疼痛，但也可能症狀輕微且具有自限性。

2025年前三個季度，全球報告病例超過18萬例。東南亞、非洲、南美洲甚至歐洲等國家都出現了大規模疫情。

在香港，基孔肯雅病毒感染主要為輸入個案。2025年截至11月4日，香港共有53例輸入個案報告，其中44例有中國內地旅行史（插圖藍色圓點）。自2025年7月以來，中國大陸已通報超過15,000人感染的大規模疫情。

10月和11月初，香港報告了3例無旅行史的患者，顯示香港出現了本地傳播。前兩例本地病例（地圖上分別標示為本地1和本地2 的紅色圓點）在流行病學上有關聯，活動區域均位於白紋伊蚊的飛行範圍內。輸入個案（黑色圓點標示10月輸入個案居住地）和本地感染病例的分佈範圍廣泛，與誘蚊器指數（地圖上為白紋伊蚊4級分布， 第一級別代表並不廣泛，第二級別代表頗為廣泛）之間無明顯關聯。

預防基孔肯雅病毒感染的主要措施集中在蚊子（香港為白紋伊蚊）媒介：防止積水，以及使用驅蚊劑進行個人防護。

地圖資料源自香港特別行政區政府衞生署衞生防護中心網頁