The Food and Environmental Hygiene Department (FEHD) today (February 6) released the first batch of gravidtrap indexes and density indexes for Aedes albopictus in February, covering 27 survey areas, as follows:
 

District	Survey Area	February 2026
		First Phase Gravidtrap Index	First Phase Density Index
Central and Western	Central and Admiralty	0.0%	N/A
Southern	Aberdeen and Ap Lei Chau	0.0%	N/A
	Deep Water Bay and Repulse Bay	0.0%	N/A
Wan Chai	Tin Hau and Causeway Bay	0.0%	N/A
Kowloon City	Hung Hom and To Kwa Wan	0.0%	N/A
	Kai Tak	0.0%	N/A
	Kowloon City	0.0%	N/A
Kwun Tong	Kowloon Bay	0.0%	N/A
	Kwun Tong Central	0.0%	N/A
	Lam Tin and Sau Mau Ping	0.0%	N/A
	Yau Tong and Cha Kwo Ling	0.0%	N/A
Wong Tai Sin	Diamond Hill and Tsz Wan Shan	0.0%	N/A
	Wong Tai Sin East	0.0%	N/A
Yau Tsim	Tsim Sha Tsui East and King's Park	0.0%	N/A
North	Fanling North	0.0%	N/A
Sha Tin	Sha Tin East	0.0%	N/A
	Sha Tin Town Centre and Fo Tan	0.0%	N/A
	Tai Wai	0.0%	N/A
Tai Po	Tai Po East	0.0%	N/A
Kwai Tsing	Kwai Chung East	0.0%	N/A
	Tsing Yi North	0.0%	N/A
	Tsing Yi South	0.0%	N/A
Tsuen Wan	Ma Wan and Sham Tseng	0.0%	N/A
	Tsuen Wan West	0.0%	N/A
Tuen Mun	So Kwun Wat	0.0%	N/A
	Tuen Mun West	0.0%	N/A
Yuen Long	Tin Shui Wai	0.0%	N/A

     Among the first batch of First Phase Gravidtrap Indexes covering 27 survey areas in February, all were 0 per cent, indicating that the distribution of Aedes albopictus mosquitoes was not extensive.

     Among these 27 survey areas, all recorded a decrease or remained unchanged 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.

     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 (DF). 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/Friday, February 6, 2026
Issued at HKT 17:00

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