April Gravidtrap Index Reveals Rising Aedes Albopictus Mosquito Levels in Multiple Hong Kong Districts

2026-04-30 22:20 Last Updated At：22:28

FEHD releases fifth batch of gravidtrap indexes for Aedes albopictus in April

The Food and Environmental Hygiene Department (FEHD) today (April 30) released the fifth batch of gravidtrap indexes and density indexes for Aedes albopictus in April, covering 39 survey areas, as follows:

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

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

District

Survey Area

April 2026

First Phase Gravidtrap Index

First Phase Density Index

Eastern

North Point and Quarry Bay

6.7%

1.0

Islands

Cheung Chau

5.6%

1.7

North

Fanling South

2.5%

1.0

Sha Tin

Ma On Shan

6.3%

1.3

Tai Wai

1.7%

1.0

Kwai Tsing

Kwai Chung East

10.5%

1.5

Kwai Chung West

2.3%

1.0

Tsuen Wan

Tsuen Wan Town

1.8%

1.0

Tuen Mun

Tuen Mun North

9.7%

1.3

District

Survey Area

April 2026

Area Gravidtrap Index

Area Density Index

Central and Western

Kennedy Town and Shek Tong Tsui

6.7%

1.0

Eastern

Chai Wan

7.3%

1.0

Shau Kei Wan and Sai Wan Ho

12.6%

1.4

Southern

Aberdeen and Ap Lei Chau

6.5%

1.0

Deep Water Bay and Repulse Bay

5.9%

1.1

Wan Chai

Happy Valley and Tai Hang

3.5%

1.3

Tin Hau and Causeway Bay

7.6%

1.1

Wan Chai

4.5%

1.0

Islands

Tung Chung

1.0%

1.0

Kowloon City

Ho Man Tin

5.3%

1.2

Kai Tak

10.6%

1.4

Kowloon Tong

8.5%

1.5

Kwun Tong

Kwun Tong Central

2.4%

1.0

Mong Kok

Mong Kok and Tai Kok Tsui

1.7%

1.0

Sham Shui Po

Cheung Sha Wan

8.5%

1.1

Lai Chi Kok

4.4%

1.4

Sham Shui Po and Shek Kip Mei

5.7%

1.1

Yau Tsim

Tsim Sha Tsui and Yau Ma Tei

7.1%

1.0

North

Fanling North

2.4%

1.0

Sheung Shui

20.3%

1.1

Sai Kung

Tseung Kwan O East

8.9%

1.1

Tseung Kwan O North

13.6%

1.5

Tseung Kwan O West

6.4%

1.6

Sha Tin

Sha Tin Town Centre and Fo Tan

9.3%

1.2

Tai Po

Tai Po East

34.7%

1.9

Tai Po West

7.0%

1.0

Tsuen Wan

Sheung Kwai Chung

4.7%

1.0

Tuen Mun

Tuen Mun South

11.8%

1.1

Yuen Long

Tin Shui Wai

6.1%

1.0

Yuen Long Town

5.2%

1.3

Among the fifth batch of First Phase Gravidtrap Indexes covering nine survey areas and Area Gravidtrap Indexes covering 30 survey areas in April, all were below 10 per cent, except for the First Phase Gravidtrap Index of Kwai Chung East in Kwai Tsing District, and the Area Gravidtrap Indexes of Shau Kei Wan and Sai Wan Ho in Eastern District, Kai Tak in Kowloon City District, Sheung Shui in Northern District, Tseung Kwan O North in Sai Kung District, Tai Po East in Tai Po District and Tuen Mun South in Tuen Mun District.

With reference to the data in the past few years, the gravidtrap indexes start to rise from April or May every year. The actual beginning time and extent of rise are affected by factors like weather and rainfall. The average temperature and rainfall in April this year were higher than those of the same period last year, creating favourable conditions for mosquito growth and breeding and thus leading to the earlier rise of gravidtrap indexes this year, but the overall trend and extent of rise are similar to those of previous years. In response to the rise of gravidtrap indexes, the FEHD, together with relevant departments and stakeholders, have implemented rapid response measures and deployed targeted actions.

For Kwai Chung East in Kwai Tsing District, Shau Kei Wan and Sai Wan Ho in Eastern District, Kai Tak in Kowloon City District, Sheung Shui in Northern District, Tseung Kwan O North in Sai Kung District, Tai Po East in Tai Po District, and Tuen Mun South in Tuen Mun District, 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. In particular, the gravidtrap data for Kwai Chung East showed that areas with more mosquito problems included parks, schools and public housing estates; the gravidtrap data for Shau Kei Wan and Sai Wan Ho, Kai Tak, and Tseung Kwan O North showed that areas with more mosquito problems included parks, schools, and public and private housing estates; the gravidtrap data for Sheung Shui showed that areas with more mosquito problems included parks, schools, public housing estates and village houses; the gravidtrap data for Tai Po East showed that areas with more mosquito problems included parks, schools, public and private housing estates, and hospitals; and the gravidtrap data for Tuen Mun South showed that areas with more mosquito problems included parks, and public and private housing estates.

In response to the high-risk areas identified in the said survey areas, the FEHD has initiated two prosecutions against a relevant construction site contractor and a venue management contractor following the discovery of mosquito breeding at a construction site and a park in Tai Po District. Furthermore, following the discovery of stagnant water and stagnant water containers in a construction site in Eastern District and two private housing estates in Tai Po District, a total of three statutory notices have been issued to the relevant construction site contrctor and property management companies, requiring the clearance of such items within specified timeframe. The FEHD and the relevant departments 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.

The FEHD has so far released five batches of gravidtrap indexes for Aedes albopictus in April 2026, covering 61 survey areas. Among these 61 survey areas, one recorded a decrease or remained unchanged as compared to the Area Gravidtrap Index last month (i.e. March 2026), representing that the area’s mosquito infestation improved or maintained a low level. Fifty other areas recorded a slight increase, but the indexes were lower than 10 per cent.

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 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#).

Experience 'Mona Lisa' and Renaissance Art at Hong Kong Heritage Museum Exhibition Starting Tomorrow

Hong Kong Heritage Museum offers multimedia immersive experience of "Mona Lisa" and showcases Renaissance treasures

The Hong Kong Heritage Museum (HKHM) is staging "The Hong Kong Jockey Club Series: Meet Mona Lisa & Portraying the Renaissance" exhibition starting from tomorrow (May 1) until July 27. Offering visitors a dual experience for one exhibition - taking audiences on a journey through time and exploring the famous "Mona Lisa" painting, as well as featuring art treasures from various French and Italian cultural institutions, which reveal the glorious age of the Renaissance.

Addressing the opening ceremony held today (April 30), the Secretary for Culture, Sports and Tourism, Miss Rosanna Law, said that this exhibition is undoubtedly a highlight programme of this year's French May Arts Festival. Through an immersive digital journey, alongside outstanding artworks on loan from exceptional museums and art institutions, visitors can step inside the frame and experience new life from classical heritage. By bringing "Mona Lisa" to the people, the exhibition offers visitors a unique opportunity to engage with art in a way that is interactive, educational, and deeply moving.

Other officiating guests included the Consul General of France in Hong Kong and Macau, Mrs Christile Drulhe; Steward of the Hong Kong Jockey Club Mr Nicholas Hunsworth; Co-chairman of the Board of French May Arts Festival Ms Pansy Ho; the Vice President of the Grand Palais Immersif, Mr Vincent Larnicol; the Chief Curator of Italian Painting of the Sixteenth Century of the Musée du Louvre, Mr Vincent Delieuvin; the Curator and Art Historian of the Musée national de la Renaissance, Dr Matteo Gianeselli; the Director of Leisure and Cultural Services, Ms Manda Chan; and the Museum Director of the HKHM, Mr Brian Lam.

Mona Lisa "narrates" the stories behind her mysterious smile

The first section of the exhibition "Meet Mona Lisa", is centred on Leonardo da Vinci's masterpiece, the "Mona Lisa". The Musée du Louvre and the Grand Palais Immersif specially created a multimedia immersive experience for Hong Kong. Composing the extraordinary journey of this portrait spanning more than 500years into six chapters, Mona Lisa herself narrates the captivating stories behind that mysterious smile of hers, in a monologue.

Leonardo da Vinci's precious original manuscripts showcase the captivating charm of the Renaissance

The second section "Portraying the Renaissance" highlights a selection of Renaissance art treasures from several renowned museums and cultural institutions, including the Musée national de la Renaissance and the Pinacoteca Ambrosiana, in diverse forms of art such as paintings, prints, sculptures, decorative art, and everyday objects. Most exhibits are being shown in Hong Kong for the first time, including four precious Leonardo da Vinci manuscripts, and works by other artists of the Renaissance period, for example, "The Virgin and Child with the Infant Saint John the Baptist" by Luca Penni, "The Crucifixion" by Noël Bellemare, and Michelangelo Buonarroti's "The Rebellious Slave" (plaster reproduction cast using moulds).

Exhibits from the HKHM collection and paintings by Chinese Mainland artist Xu Lei that echo Renaissance art are also on display, enabling a dialogue across time and space and highlighting the influence of this cultural movement that originated in 14th century Europe. Furthermore, the museum lobby features a giant 5-metre animated installation that blends Hong Kong-style neon elements with classic art symbols to create a unique Hong Kong version of the "Mona Lisa".

A series of talks, film screenings, public guided tours and tactile experience workshops will be held during the exhibition, allowing visitors to gain a deeper understanding of the "Mona Lisa" and the captivating charm of Renaissance art. The first talk will be held on May 1 at 3pm at the Theatre at the HKHM. The speaker, Mr Delieuvin, will visit Hong Kong to share his insights on "Why 'Mona Lisa'? Discover What's So Special About the Most Famous Painting in the World".

To ensure a better visiting experience, crowd control measures for the exhibition will be implemented with flexibility. In the event of overcrowding, timed admission ticketing may be arranged. Visitors are advised to follow on-site notices and to stay updated through the HKHM's official website, Instagram or VisitHKMuseums on Xiaohongshu.

The exhibition will be held at Thematic Galleries 3, 4 and 5, 1/F of the HKHM. Admission is free. The exhibition is jointly presented by the Leisure and Cultural Services Department and the French May Arts Festival, jointly organised by the HKHM and the French May Arts Festival. The title sponsor is the Hong Kong Jockey Club Charities Trust, with support from the Consulate General of France in Hong Kong. For details of the exhibition and activities, please visit hk.heritage.museum/en/exhibitions/monalisa2026.html.

April Gravidtrap Index Reveals Rising Aedes Albopictus Mosquito Levels in Multiple Hong Kong Districts

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