FEHD releases fifth batch of gravidtrap indexes for Aedes albopictus in December
Source: Hong Kong Government special administrative region
FEHD releases fifth batch of gravidtrap indexes for Aedes albopictus in December
District
District Among the fifth batch of First Phase Gravidtrap Indexes covering nine survey areas and Area Gravidtrap Indexes covering six survey areas in December, all were below 10 per cent, and most of the areas recorded zero per cent, indicating that the distribution of Aedes albopictus mosquitoes was not extensive.
The FEHD has so far released five batches of gravidtrap indexes for Aedes albopictus in December 2025, covering 64 survey areas. Among these 64 survey areas, 60 recorded a decrease or remained unchanged in the individual gravidtrap index compared to the Area Gravidtrap Index last month, i.e. November 2025, representing that the areas’ mosquito infestation improved or maintained a low level. Four other areas recorded a slight increase, but the indexes were lower than 10 per cent. 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 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#Issued at HKT 17:00