FEHD Reports Rising Aedes albopictus Gravidtrap Indexes Across Multiple Districts in May 2026.

2026-05-19 19:38 Last Updated At：19:48

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

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

Click to Gallery

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

More Images

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

District

Survey Area

May 2026

First Phase Gravidtrap Index

First Phase Density Index

Southern

Pok Fu Lam

13.8%

1.1

Kowloon City

Ho Man Tin

25.0%

1.2

Kwun Tong

Yau Tong and Cha Kwo Ling

28.8%

1.8

Wong Tai Sin

Wong Tai Sin West

24.5%

1.6

Sha Tin

Sha Tin Town Centre and Fo Tan

18.2%

1.4

Tai Wai

46.0%

1.7

Tsuen Wan

Ma Wan and Sham Tseng

31.5%

1.8

District

Survey Area

May 2026

Area Gravidtrap Index

Area Density Index

Wan Chai

Tin Hau and Causeway Bay

8.8%

1.3

Wan Chai

5.5%

1.3

Islands

Cheung Chau

12.0%

1.5

Kowloon City

10.3%

1.0

Kwun Tong

Lam Tin and Sau Mau Ping

27.7%

1.7

Mong Kok

Mong Kok and Tai Kok Tsui

0.9%

1.0

Wong Tai Sin

Wong Tai Sin East

16.7%

1.3

Yau Tsim

Tsim Sha Tsui East and King's Park

9.1%

1.4

North

Fanling South

14.9%

1.4

Kwai Tsing

Tsing Yi South

15.0%

1.1

Tuen Mun

Tuen Mun North

9.4%

1.1

Yuen Long

Tin Shui Wai

13.0%

1.0

The third batch of gravidtrap indexes for Aedes albopictus in May includes First Phase Gravidtrap Indexes covering seven survey areas and Area Gravidtrap Indexes covering 12 survey areas. Among which, 14 survey areas recorded gravidtrap indexes above 10 per cent, while Ho Man Tin in Kowloon City District; Yau Tong and Cha Kwo Ling, and Lam Tin and Sau Mau Ping in Kwun Tong District; Wong Tai Sin West in Wong Tai Sin District; Tai Wai in Sha Tin District; as well as Ma Wan and Sham Tseng in Tsuen Wan District, recorded gravidtrap indexes above 20 per cent.

With reference to the data from the past few years, the gravidtrap indexes start to rise from April or May every year. The actual timing and extent of the rise are affected by factors like weather conditions and rainfall. The average temperature and rainfall recorded in April this year were higher than those in the same period last year, creating favourable conditions for mosquito growth and breeding. As a result, the rise in gravidtrap indexes occurred earlier this year. With the increase in rainfall in the first half of May, the gravidtrap indexes are expected to rise further.

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. Moreover, the FEHD has initiated three prosecutions against the relevant construction site contractor, estate management company and property management company following the discovery of mosquito breeding at a construction site, a public housing estate and a private housing estate in Sha Tin District and Tsuen Wan District. Furthermore, following the discovery of stagnant water or stagnant water containers at a total of four parks, a construction site, four public housing estates, four private housing estates, a school and two private premises in Kowloon City District, Kwun Tong District, Wong Tin Sin District, Sha Tin District, Tsuen Wan District and Yuen Long District, the FEHD has issued 16 statutory notices to the relevant venue management companies, a construction site contractor, estate management companies, property management companies and responsible persons of private premises, requiring the clearance of such items within a specified timeframe. The FEHD also issued a warning letter to a school in Wong Tai Sin District following the discovery of potential mosquito problems. The FEHD, the relevant departments and stakeholders are following up on the mosquito control work, and will 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. In addition, the FEHD will strengthen the monitoring of the gravidtrap index in the areas to review the effectiveness of the mosquito control work.

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 thepremises;

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#).

Hong Kong Enhances Ebola Preparedness Amid WHO Emergency Declaration for Congo and Uganda Outbreaks

CHP continues to closely monitor Ebola outbreak in Africa and is vigilant in guarding against imported cases

In response to the World Health Organization (WHO) recently declaring that the Ebola disease epidemic in the Democratic Republic of the Congo and Uganda a Public Health Emergency of International Concern, the Centre for Health Protection (CHP) of the Department of Health today (May 19) is continuing to collaborate closely with various stakeholders to implement a series of prevention and control measures, in accordance with the Hong Kong Special Administrative Region (HKSAR) Government's Preparedness and Response Plan for Ebola Virus Disease (the Response Plan). These measures are intended to guard against imported cases and safeguard public health. While the immediate health impact of Ebola disease on the public health in Hong Kong is currently low, the CHP is fully prepared to respond to an outbreak should one occur. Members of the public are advised to avoid visiting affected regions unless absolutely necessary.

Latest information from WHO

---------------------------------

According to the latest report from the WHO and the Africa Centres for Disease Control and Prevention, as of May 18, the Democratic Republic of the Congo has reported eight confirmed cases of Ebola disease, 395 suspected cases and 106 related deaths. Uganda has also reported two cases of Ebola disease and one related death.

Port health measures

------------------------

The CHP conducts health screenings for arrivals at all boundary control points. Although there are no direct flights between Hong Kong and the countries affected by the outbreak, travellers may transit via Addis Ababa, the capital of Ethiopia, en route to Hong Kong from Africa. Therefore, the CHP has immediately strengthened health screenings for passengers arriving on flights from Addis Ababa. Port Health Division officers conduct temperature checks and health screenings for passengers from these specific flights at the arrival gate of the air-bridge.

At the same time, notices have been posted in the airport's arrival area. The CHP has co-ordinated with the Airport Authority Hong Kong (AAHK) to broadcast announcements in the arrival hall. The CHP is also urging, through relevant airlines, passengers who have visited the Democratic Republic of the Congo or Uganda within the past 21 days to proactively declare their travel history to the Port Health Division officers upon arrival in Hong Kong for further health assessment. Regarding the isolation and referral mechanism for suspected cases, if an inbound traveller exhibits relevant symptoms and is assessed as a suspected case by the Port Health Division officers, arrangements will be made immediately to transfer the individual to the Hospital Authority (HA) Infectious Disease Centre for isolation and examination. The individual will remain in isolation until the specimens test negative for the virus.

The CHP has also provided the AAHK and airlines with the latest information on the virus and urged airlines to remind their flight crews to strictly enforce established prevention and control measures if they identify suspected cases on their flights. Furthermore, the CHP has stepped up its publicity efforts at all boundary control points, including making public announcements and displaying posters, to remind travellers to be vigilant about Ebola.

Disease surveillance

-----------------------

The CHP has sent a letter to all doctors and hospitals in Hong Kong to remind them of the latest situation of Ebola disease and to update the reporting criteria for suspected cases based on the latest epidemic information. Any person who has travelled to affected areas (including the Democratic Republic of the Congo and Uganda) within the past 21 days and exhibits relevant symptoms must be managed as a suspected case. The CHP urged doctors to remain highly vigilant and to immediately report any suspected cases to the CHP via the 24-hour hotline provided in the letter.

As of today, no confirmed or suspected Ebola disease cases have been recorded in Hong Kong.

In addition, the CHP convened a meeting yesterday (May 18) with representatives from the HA Head Office, Chief Infection Control Officer Office, and the HA's experts in infectious disease and clinical microbiology, to discuss various issues thoroughly, including the isolation and testing of suspected cases, infection control measures and quarantine arrangements for close contacts.

Quarantine facilities

-----------------------

The CHP has also inspected the Penny's Bay Community Isolation Facility, which has been placed on standby mode, to ensure that it is ready for use as a quarantine facility should the need arise. Should a case be laboratory-confirmed as Ebola disease, the CHP will follow established protocols to trace contacts and arrange for their quarantine.

Public education

--------------------

The CHP will continue to enhance risk communication and health education for the public via various online and offline channels, including press releases, social media posts and media interviews. In addition, the CHP will meet with African non-governmental organisations (NGOs) tomorrow (May 20) to convey relevant health information to Africans living in Hong Kong via these NGOs. The CHP has also distributed health promotional materials at venues in Tsim Sha Tsui, where relatively more Africans stay.

The HKSAR Government announced on May 17 the activation of the Alert Response Level in accordance with the Response Plan to safeguard public health. Relevant government departments are fully prepared and will closely monitor the development of the epidemic, adjusting prevention and control strategies as necessary.

As the current risk of infection is primarily concentrated in affected areas overseas, the CHP urged members of the public to exercise caution and avoid non-essential travel to affected countries and regions. Relevant travel advice has been uploaded to the Security Bureau's Outbound Travel Alerts webpage. The CHP will continue to closely monitor the latest overseas developments and the latest recommendations from the WHO, taking appropriate follow-up actions and implementing prevention and control measures based on risk assessments to safeguard public health.

FEHD Reports Rising Aedes albopictus Gravidtrap Indexes Across Multiple Districts in May 2026.

HK