Hong Kong – FEHD releases 11th batch of gravidtrap indexes for Aedes albopictus in August

The Food and Environmental Hygiene Department (FEHD) today (September 2) launched the 11th batch of gravidtrap indexes and density indexes for Aedes albopictus in August, covering 11 study locations, as follows:

Amongst the 11th batch of First Phase Gravidtrap Indexes covering 2 study locations and Area Gravidtrap Indexes covering 9 study locations in August, all were listed below 10 percent.

The FEHD has actually up until now launched 11 batches of gravidtrap indexes for Aedes albopictus in August 2025, covering 64 study locations. Amongst these 64 study locations, 44 taped a reduction or stayed the same in the private gravidtrap index as compared to the Area Gravidtrap Index last month, i.e. July 2025, representing that the locations’ mosquito invasion enhanced or preserved a low level. Fifteen other locations taped a minor boost, however the indexes were lower than 10 percent.

Public involvement is essential to efficient control of mosquito issues. The FEHD interest members of the general public to continue to interact in reinforcing individual mosquito control procedures, consisting of:

• clean their properties and look for any build-up of water inside their facilities;
• get rid of all unneeded water collection and get rid of the sources;
• check home products (those put in outside and open locations in specific), such as refuse containers, vases, a/c drip trays, and laundry racks to avoid stagnant water;
• alter the water in flower vases and dishes of potted plants a minimum of as soon as every 7 days;
• appropriately cover all containers that hold water to avoid mosquitoes from accessing the water; and
• effectively get rid of short articles that can include water, such as empty lunch boxes and cans.

Beginning in August this year, following the conclusion of the security of private study locations, and as soon as the current gravidtrap index and the density index are offered, the FEHD will share the appropriate info through news release, its site, and social networks. It intends to enable members of the general public to rapidly comprehend the mosquito invasion circumstance and enhance mosquito control efforts, thus lowering the danger of chikungunya fever (CF) transmission.

Following the suggestions from the World Health Organization and considering the regional circumstance in Hong Kong, the FEHD establishes gravidtraps in districts where mosquito-borne illness have actually been tape-recorded in the past, in addition to in largely inhabited locations such as real estate estates, healthcare facilities and schools to keep track of the breeding and circulation of Aedes albopictus mosquitoes, which can send CF and dengue fever. At present, the FEHD has actually established gravidtraps in 64 study locations of the neighborhood. Throughout the 2 weeks of monitoring, the FEHD will gather the gravidtraps when a week. After the very first week of security, the FEHD will instantly analyze the glue boards inside the recovered gravidtraps for the existence of adult Aedine mosquitoes, to put together the Gravidtrap Index (First Phase) and Density Index (First Phase). At the end of the 2nd week of security, the FEHD will immediately examine the glue boards for the existence of adult Aedine mosquitoes. Information of the 2 weeks’ monitoring will be integrated to get the Area Gravidtrap Index and the Area Density Index. The gravidtrap and density indexes for Aedes albopictus in various study locations along with info on mosquito avoidance and control procedures are readily available on the department’s website (www.fehd.gov.hk/english/pestcontrol/dengue_fever/Dengue_Fever_Gravidtrap_Index_Update.html#).