FEHD releases seventh batch of gravidtrap indexes for Aedes albopictus in October
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| District | Survey Area | October 2025 | |
| First Phase Gravidtrap Index | First Phase Density Index | ||
| Kowloon City | Hung Hom | 12.5% | 1.1 |
| Kai Tak North | 19.5% | 1.4 | |
| North | |||
| Fanling | 0.0% | N/A | |
| Yuen Long | Tin Shui Wai | 1.6% | 1.0 |
| Tsuen Wan | Tsuen Wan Town | 0.0% | N/A |
| Ma Wan | 4.2% | N/A | |
| District | Survey Area | October 2025 | |
| Area Gravidtrap Index | Area Density Index | ||
| Central and Western | Sai Wan | 3.7% | 1.3 |
| Eastern | Shau Kei Wan and Sai Wan Ho | 6.5% | 1.1 |
| Southern | Aberdeen and Ap Lei Chau | 0.0% | N/A |
| Deep Water Bay and Repulse Bay | 0.9% | 1.0 | |
| Wan Chai | Tin Hau | 5.6% | 1.0 |
| Yau Tsim | Tsim Sha Tsui | 0.0% | N/A |
| Kowloon City | Lok Fu West | 7.6% | 1.2 |
| Kwun Tong | Kwun Tong Central | 1.2% | 1.0 |
| Sha Tin | Tai Wai | 0.8% | 1.0 |
| Ma On Shan | 6.4% | 1.1 | |
| Sha Tin Town Centre and Fo Tan | 2.9% | 1.0 | |
| Yuen Long | Yuen Kong | 0.0% | N/A |
| Ki Lun Shan | 0.0% | N/A | |
| Sung Shan | 0.0% | N/A | |
| Tuen Mun | Tuen Mun South | 0.0% | N/A |
| Tsuen Wan | Tsuen Wan West | 1.0% | 1.0 |
| Kwai Tsing | Tsing Yi South | 2.6% | 1.0 |
The FEHD is concerned about two survey areas in Kowloon City District where the gravidtrap indexes have exceeded 10%, indicating that the mosquito prevention and control measures in nearby premises need to be strengthened. The FEHD has stepped up inspections and followed up with the persons responsible for the management of relevant premises. Mosquito breeding was found in nearby residential estates and construction sites, along with damaged facilities that led to accumulation of water. As a result, the FEHD instituted a prosecution and issued seven statutory notices to the relevant property management company in accordance with Section 27 of the Public Health and Municipal Services Ordinance (Cap. 132), requiring the company's responsible person to eliminate mosquito breeding grounds. Two prosecutions and five statutory notices were also issued to the contractors of the relevant construction sites. In addition, the FEHD has visited schools, elderly homes and childcare facilities in the surrounding area to provide mosquito prevention and elimination information. New mosquito traps were installed in the schools to enhance mosquito control efforts. These inspections will continue. According to records, the FEHD has initiated a total of 10 prosecutions against contractors in the survey areas and surrounding construction sites for mosquito breeding over the past six months.
The FEHD will hold interdepartmental meetings with relevant departments and stakeholders to identify locations with higher mosquito infestations and carry out intensive and targeted mosquito control measures. The FEHD will also distribute leaflets and posters, and notify residential estates that have subscribed to the gravidtrap Rapid Alert System, advising management agents and residents to stay vigilant and work together on mosquito prevention and elimination measures. In addition, the FEHD will strengthen monitoring of the gravidtrap index in the area to review the effectiveness of the mosquito control work.
The FEHD has so far released seven batches of gravidtrap indexes for Aedes albopictus in October 2025, covering 64 survey areas. Among these 64 survey areas, 44 recorded a decrease or remained unchanged in the individual gravidtrap index as compared to the Area Gravidtrap Index last month, i.e. September 2025, representing that the areas' mosquito infestation improved or maintained a low level. Eighteen other areas recorded a slight increase, but the indexes were lower than 10 per cent.
In response to the recent chikungunya fever (CF) situation, the FEHD has implemented special mechanism to strengthen mosquito control work in areas with a gravidtrap index between 10 per cent and 20 per cent, instead of 20 per cent or above under the original mechanism.
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 saucers of potted plants at least once every seven days;
- properly cover all containers that hold water to prevent mosquitoes from accessing the water; and
- properly dispose of articles that can contain water, such as empty lunch boxes and cans.
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 is disseminating the 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 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/Friday, October 31, 2025
Issued at HKT 21:27
Issued at HKT 21:27
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