FEHD releases second batch of gravidtrap indexes for Aedes albopictus in December

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The Food and Environmental Hygiene Department (FEHD) today (December 16) released the second batch of gravidtrap indexes and density indexes for Aedes albopictus in December, covering 32 survey areas, as follows:

District	Survey Area	December 2025
District	Survey Area	First Phase Gravidtrap Index	First Phase Density Index
Central and Western	Central and Admiralty	0.0%	N/A
Central and Western	Sheung Wan and Sai Ying Pun	0.0%	N/A
Southern	Pokfulam	0.0%	N/A
Islands	Cheung Chau North	0.0%	N/A
Islands	Tung Chung	0.0%	N/A
Yau Tsim	Tsim Sha Tsui East	0.0%	N/A
Sham Shui Po	Cheung Sha Wan	0.0%	N/A
	Lai Chi Kok	0.0%	N/A
	Sham Shui Po East	0.0%	N/A
Kowloon City	Kowloon City North	0.0%	N/A
Wong Tai Sin	Wong Tai Sin Central	0.0%	N/A
	Wong Tai Sin West	0.0%	N/A
	Diamond Hill	0.0%	N/A
	Ngau Chi Wan	0.0%	N/A
Kwun Tong	Lam Tin and Sau Mau Ping	0.0%	N/A
Sai Kung	Tseung Kwan O East	0.0%	N/A
	Tseung Kwan O North	2.3%	1.0
	Sai Kung Town	1.9%	1.0
	Ngau Liu and Muk Min Shan	0.0%	N/A
Tai Po	Tai Po West	0.0%	N/A
Yuen Long	Yuen Long Town	0.0%	N/A
Tuen Mun	Tuen Mun North	1.6%	1.0
	Tuen Mun West	0.0%	N/A
	So Kwun Wat	0.0%	N/A
Tsuen Wan	Sheung Kwai Chung	0.0%	N/A
Kwai Tsing	Kwai Chung	0.0%	N/A
Kwai Tsing	Lai King	0.0%	N/A

District	Survey Area	December 2025
District	Survey Area	Area Gravidtrap Index	Area Density Index
Wan Chai	Happy Valley	0.9%	1.0
Mong Kok	Mong Kok	0.0%	N/A
Kowloon City	Ho Man Tin	0.0%	N/A
Sai Kung	Tseung Kwan O West	0.0%	N/A
North	Sheung Shui	1.6%	1.0

Among the second batch of First Phase Gravidtrap Indexes covering 27 survey areas and Area Gravidtrap Indexes covering five survey areas in December, all were below 10 per cent.

The FEHD has so far released two batches of gravidtrap indexes for Aedes albopictus in December 2025, covering 48 survey areas. Among these 48 survey areas, 46 recorded a decrease or remained unchanged in the individual gravidtrap index as compared to the Area Gravidtrap Index last month, i.e. November 2025, representing that the areas' mosquito infestation improved or maintained a low level. Two other areas recorded a slight increase, but the indexes were 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 this year, 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 the 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 64 survey areas of the community. During the two weeks of surveillance, 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/Tuesday, December 16, 2025
Issued at HKT 18:00

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