FEHD Releases June Gravidtrap and Density Indexes for Aedes albopictus Across 19 Survey Areas

2026-06-16 20:00 Last Updated At：20:08

FEHD releases third batch of gravidtrap indexes for Aedes albopictus in June

The Food and Environmental Hygiene Department (FEHD) today (June 16) released the third batch of gravidtrap indexes and density indexes for Aedes albopictus in June, covering 19 survey areas, as follows:

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FEHD releases third batch of gravidtrap indexes for Aedes albopictus in June Source: HKSAR Government Press Releases

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FEHD releases third batch of gravidtrap indexes for Aedes albopictus in June Source: HKSAR Government Press Releases

District	Survey Area	June 2026
District	Survey Area	First Phase Gravidtrap Index	First Phase Density Index
Central and Western	Sheung Wan and Sai Ying Pun	8.8%	2.6
Southern	Pok Fu Lam	17.2%	1.7
Wan Chai	Happy Valley and Tai Hang	8.6%	1.2
Sham Shui Po	Cheung Sha Wan	57.7%	1.7
Wong Tai Sin	Ngau Chi Wan and San Po Kong	18.5%	1.2
North	Sheung Shui	14.8%	1.0
Sai Kung	Sai Kung Town	11.5%	1.0
	Tseung Kwan O East	5.2%	1.3
	Tseung Kwan O North	19.0%	1.1
Yuen Long	Hung Shui Kiu and Ping Shan	4.2%	1.0
Yuen Long	Yuen Long Town	8.9%	1.0

District	Survey Area	June 2026
District	Survey Area	Area Gravidtrap Index	Area Density Index
Islands	Cheung Chau	9.3%	1.3
Islands	Tung Chung	4.9%	2.0
Kowloon City	Ho Man Tin	14.0%	1.1
Sham Shui Po	Lai Chi Kok	8.3%	1.1
Wong Tai Sin	Wong Tai Sin East	15.8%	1.1
Sai Kung	Tseung Kwan O West	8.2%	1.4
Tai Po	Tai Po West	16.8%	1.0
Tsuen Wan	Ma Wan and Sham Tseng	9.5%	1.3

With reference to the data from the past few years, the gravidtrap indexes start to rise from April every year. The indexes are higher from May to June. The actual timing and extent of the rise are affected by factors like weather conditions and rainfall. As compared with last year, the temperature began to climb earlier this year and the rainfall in April and May increased substantially, creating favourable conditions for mosquito growth and breeding. As a result, the rise in gravidtrap indexes occurred earlier this year. Depending on factors like rainfall, the indexes may rise further, but the overall trend of gravidtrap indexes this year is similar to those of previous years.

For survey areas which recorded indexes exceeding 10 per cent, in accordance with the mechanism implemented by the FEHD in response to the chikungunya fever (CF) situation (i.e. strengthening 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), the FEHD is collaborating with relevant departments and stakeholders to identify locations with high mosquito infestations and carry out intensive and targeted mosquito control measures, including eliminating mosquito breeding grounds, applying larvicides, conducting fogging operations to eradicate adult mosquitoes, and ensuring that mosquito trapping devices are placed at appropriate locations, as well as to strengthen efforts in publicity and education. Moreover, the FEHD has initiated four prosecutions against the relevant estate management companies and a property management company following the discovery of mosquito breeding respectively at three public housing estates and a private housing estate in Sham Shui Po District. In addition, following the discovery of stagnant water or stagnant water containers in two construction sites, two parks, a school, seven public housing estates and five private housing estates in Southern District, Sham Shui Po District, Wong Tai Sin District, North District, Sai Kung District, Kowloon City District and Tai Po District, the FEHD has issued 17 statutory notices to the responsible persons-in-charge, requiring the clearance of such items within a specified timeframe. The FEHD, the relevant departments and stakeholders also organise exhibitions, distribute leaflets and posters, and notify residential estates that have subscribed to the gravidtrap Rapid Alert System, advising property management agents and residents to stay vigilant and work together in taking mosquito prevention and elimination measures.

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 the 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 water in flower vases and scrub their inner surfaces thoroughly, and remove water in saucers under potted plants at least once a week;

properly cover all containers that hold water to prevent mosquitoes from accessing the water;

properly dispose of articles that can contain water, such as disposable meal boxes and empty 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 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 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#).

Xia Baolong Inspects Hong Kong's Development Plans and Progress on National 15th Five-Year Strategy

Director of Hong Kong and Macao Work Office of CPC Central Committee and Hong Kong and Macao Affairs Office of State Council Mr Xia Baolong arrives in Hong Kong for inspection visit (with photos/video)

The Director of the Hong Kong and Macao Work Office of the Communist Party of China Central Committee and the Hong Kong and Macao Affairs Office of the State Council, Mr Xia Baolong, arrived in Hong Kong today (June 16) to conduct an inspection of Hong Kong's alignment with the National 15th Five-Year Plan and the advancement of the Northern Metropolis development.

In the morning, Mr Xia visited the Hung Shui Kiu/Ha Tsuen New Development Area Community Liaison Centre in the company of the Chief Executive, Mr John Lee. He was briefed on the planning and development of the new development area, particularly on the pilot area of large-scale land disposal in Hung Shui Kiu and the development of the Hung Shui Kiu Industry Park. During the visit, Mr Xia was also briefed on the transport planning as well as the construction of the railway and the Smart and Green Mass Transit System in the new development area.

Mr Xia later paid a visit to the Hung Shui Kiu University Town Area to inspect the planning, development vision and latest progress of the Northern Metropolis University Town. He also visited the Light Public Housing on Yau Pok Road, Yuen Long, to listen to a briefing on the latest progress of the Light Public Housing projects. He then visited a family of four and had an exchange with them.

Next, Mr Xia visited the Microelectronics Centre in Yuen Long InnoPark to learn about the innovation and technology industry developments in Hong Kong.

In the afternoon, Mr Xia went to the Kwu Tung North New Development Area to inspect the construction progress of housing, transport, government offices and other ancillary facilities in the area. He later visited the Hong Kong-Shenzhen Innovation and Technology Park in the Loop to learn about its overall development plan and latest position, as well as the construction progress of the Sandy Ridge Data Facility Cluster site. Mr Xia afterwards visited the Central Government-Aided Emergency Hospital in the Lok Ma Chau Loop to inspect its operations.

In the evening, Mr Xia visited AsiaWorld-Expo to learn about how Hong Kong transforms mega events into new economic impetus to help the city seize the development opportunities brought about by the National 15th Five-Year Plan.

Officials accompanying the visits included the Chief Secretary for Administration, Mr Chan Kwok-ki; the Financial Secretary, Mr Paul Chan; the Secretary for Commerce and Economic Development, Mr Algernon Yau; the Secretary for Health, Professor Lo Chung-mau; the Secretary for Development, Ms Bernadette Linn; the Secretary for Housing, Ms Winnie Ho; the Secretary for Education, Dr Choi Yuk-lin; the Secretary for Innovation, Technology and Industry, Professor Sun Dong; the Secretary for Transport and Logistics, Ms Mable Chan; the Secretary for Constitutional and Mainland Affairs, Miss Janice Tse Siu-wa; and the Director of the Chief Executive's Office, Ms Carol Yip.

Mr Xia will continue his visit to Hong Kong tomorrow (June 17).

FEHD Releases June Gravidtrap and Density Indexes for Aedes albopictus Across 19 Survey Areas

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