The Food and Environmental Hygiene Department (FEHD) today (February 23) released the fourth batch of gravidtrap indexes and density indexes for Aedes albopictus in February, covering 13 survey areas, as follows:
 

District	Survey Area	February 2026
		First Phase Gravidtrap Index	First Phase Density Index
Central and Western	Kennedy Town and Shek Tong Tsui	0.0%	N/A
Sha Tin	Ma On Shan	0.0%	N/A
Tuen Mun	Tuen Mun South	0.0%	N/A

 

District	Survey Area	February 2026
		Area Gravidtrap Index	Area Density Index
Eastern	Shau Kei Wan and Sai Wan Ho	0.0%	N/A
Wan Chai	Happy Valley and Tai Hang	0.0%	N/A
Islands	Tung Chung	0.0%	N/A
Kowloon City	Ho Man Tin	0.0%	N/A
	Kowloon Tong	1.7%	1.0
Sham Shui Po	Cheung Sha Wan	0.0%	N/A
Yau Tsim	Tsim Sha Tsui and Yau Ma Tei	0.0%	N/A
North	Sheung Shui	0.0%	N/A
Tsuen Wan	Ma Wan and Sham Tseng	0.0%	N/A
Yuen Long	Yuen Long Town	0.0%	N/A

     Among the fourth batch of First Phase Gravidtrap Indexes covering three survey areas and Area Gravidtrap Indexes covering 10 survey areas in February, most of the areas recorded 0 per cent, indicating that the distribution of Aedes albopictus mosquitoes was not extensive.

     The FEHD has so far released four batches of gravidtrap indexes for Aedes albopictus in February 2026, covering 51 survey areas. Among these 51 survey areas, 50 recorded a decrease or remained unchanged in the individual gravidtrap index as compared to the Area Gravidtrap Index last month, i.e. January 2026, representing that the areas' mosquito infestation improved or maintained a low level. Only one area recorded a slight increase, but the index was lower than 10 per cent.

     ​The eggs of Aedes albopictus can withstand long periods of desiccation and will hatch when the temperature becomes suitable and water is present. Members of the public should continue to take mosquito control measures during winter to eliminate mosquito eggs.

     Public participation is crucial to the effective control of mosquito problems. The FEHD appeals to members of the public to continue to work together in strengthening personal mosquito control measures, including:

• tidy up their premises and check for any accumulation of water inside their premises;
• remove all unnecessary water collections and eliminate the sources;
• check household items (those placed in outdoor and open areas in particular), such as refuse containers, vases, air conditioner drip trays, and laundry racks to prevent stagnant water;
• change the water in flower vases and clear the water in saucers of potted plants at least once every seven days;
• properly cover all containers that hold water to prevent mosquitoes from accessing the water;
• properly dispose of articles that can contain water, such as empty lunch boxes and cans; and
• scrub drains and surface sewers with alkaline detergent at least once a week to remove any mosquito eggs.

     Starting in August 2025, following the completion of the surveillance of individual survey areas, and once the latest gravidtrap index and the density index are available, the FEHD has been disseminating relevant information through press releases, its website and social media. It aims to allow members of the public to quickly grasp the mosquito infestation situation and strengthen mosquito control efforts, thereby reducing the risk of chikungunya fever (CF) transmission.

     Following recommendations from the World Health Organization and taking into account the local situation in Hong Kong, the FEHD sets up gravidtraps in districts where mosquito-borne diseases have been recorded in the past, as well as in densely populated places such as housing estates, hospitals and schools to monitor the breeding and distribution of Aedes albopictus mosquitoes, which can transmit CF and dengue fever. At present, the FEHD has set up gravidtraps in 62 survey areas of the community, with a surveillance period of two weeks. During the surveillance period, the FEHD will collect the gravidtraps once a week. After the first week of surveillance, the FEHD will immediately examine the glue boards inside the retrieved gravidtraps for the presence of adult Aedine mosquitoes to compile the Gravidtrap Index (First Phase) and Density Index (First Phase). At the end of the second week of surveillance, the FEHD will instantly check the glue boards for the presence of adult Aedine mosquitoes. Data from the two weeks of surveillance will be combined to obtain the Area Gravidtrap Index and the Area Density Index. The gravidtrap and density indexes for Aedes albopictus in different survey areas, as well as information on mosquito prevention and control measures, are available on the department's webpage (www.fehd.gov.hk/english/pestcontrol/dengue_fever/Dengue_Fever_Gravidtrap_Index_Update.html#).

Ends/Monday, February 23, 2026
Issued at HKT 17:00

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