Public urged to strengthen anti-mosquito efforts
The Food and Environmental Hygiene Department (FEHD) today (June 11) announced that the monthly gravidtrap index for Aedes albopictus mosquitoes in May was 8.6 per cent, at Level 2, indicating that the distribution of Aedes albopictus mosquitoes in the survey areas was fairly extensive. Relevant government departments have stepped up mosquito prevention and control actions.
In May, among the 64 survey areas, the area gravidtrap index in six areas exceeded the alert level of 20 per cent. The gravidtraps were mostly located in the vicinity of private residential areas, public housing estates, schools, recreational and sports facilities and public places. The FEHD has collaborated with relevant government departments by taking immediate action to strengthen mosquito prevention and control work in the area concerned.
Moreover, the monthly density index for Aedes albopictus in May was 1.3, which represented that an average of 1.3 Aedes albopictus adults were found in the Aedes-positive gravidtraps, indicating that the number of adult Aedes albopictus was not abundant in the survey areas. The gravidtrap and density indices for Aedes albopictus in different survey areas as well as information on mosquito prevention and control measures are available on the department website at www.fehd.gov.hk.
A spokesman for the FEHD said, "There is a significant relationship between local mosquito infestation and seasonal changes. The gravidtrap indices in various survey areas would be relatively higher during hot and rainy spring and summer months (i.e. from May to September) as mosquitoes breed quickly. Members of the public are reminded to continue the routine mosquito prevention and control work, especially the repair and maintenance of structures. Cracks and dents that may accumulate water and become potential breeding grounds should be filled and levelled to reduce the chance of mosquito breeding."
"The Government is concerned about the mosquito infestation in May. The increase in the monthly gravidtrap index for Aedes albopictus for May might be related to the continuously hot and rainy days in the month. The FEHD has continued to intensify the mosquito prevention and control work with relevant government departments in areas under their purview, including eliminating mosquito breeding places, applying larvicides, conducting fogging operations to eradicate adult mosquitoes, and placing mosquito trapping devices at suitable locations. The FEHD has also conducted site inspections with relevant departments, and provided them with professional advice and technical support to assist them in formulating and implementing effective anti-mosquito measures swiftly. At the same time, the FEHD has strengthened publicity and education. The FEHD will continue to monitor the mosquito infestation in all districts, and will conduct prompt and effective mosquito prevention and control work," the spokesman continued.
The FEHD will conduct a three-phase Anti-mosquito Campaign this year. The second phase of the territory-wide campaign was launched on April 14 and will run until June 13. During the period, the district offices of the FEHD will target areas that have drawn particular concern, such as public markets, cooked food centres and hawker bazaars, single-block buildings, streets and back lanes, common parts of buildings, village houses, construction sites, vacant sites and road works sites, to remove accumulated water and carry out mosquito prevention and control work. To further enhance the effectiveness of mosquito control, the FEHD and relevant government departments have carried out phase two of the All-out Anti-mosquito Operations from May 7. In addition to the work of phase one, including eliminating potential mosquito breeding places, the FEHD called on property management entities to arrange for necessary repairs to their premises to minimise mosquito breeding places and commence adult mosquito control measures by means of regular ultra-low volume fogging operations.
The FEHD appeals to members of the public to continue to stay alert and work together to carry out mosquito prevention and control measures early, including inspecting their homes and surroundings to remove potential breeding grounds, changing water in vases and scrubbing their inner surfaces, removing water in saucers under potted plants at least once a week, properly disposing of containers such as soft drink cans and lunch boxes, and drilling large holes in unused tyres. The FEHD also advises members of the public and estate management bodies to keep drains free of blockage and level all defective ground surfaces to prevent the accumulation of water. They should also scrub all drains and surface sewers with an alkaline detergent at least once a week to remove any mosquito eggs.
Aedes albopictus is a kind of mosquito that can transmit dengue fever (DF). DF is commonly found in tropical and subtropical regions of the world, and has become endemic in many countries in Southeast Asia. In 2024, the World Health Organization recorded over 14 million DF cases, which was a record number. The dengue activity in neighbouring areas has remained high. Members of the public should stay vigilant and continue to carry out effective mosquito prevention and control measures.
Summer influenza season nears its end and winter influenza season yet to begin Public must remain vigilant despite influenza activity declines
The Centre for Health Protection (CHP) of the Department of Health today (January 3) reminded the public that seasonal influenza activity has gradually declined over the past two weeks to near baseline levels. This indicated that the summer influenza season, which began in early September last year, might conclude within the next one to two weeks. Nevertheless, the CHP urged the public to remain vigilant and maintain good personal and environmental hygiene at all times. Those who have not yet received seasonal influenza vaccination (SIV), particularly high-risk groups such as pregnant women, the elderly, children and those with underlying illnesses, should receive SIV promptly to reduce the risk of severe illness and death from infection.
Latest surveillance data
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"Hong Kong entered the summer influenza season in early September last year. The seasonal influenza activity peaked in mid-to-late October last year and has since been gradually declining. The latest surveillance data shows that the percentage of respiratory specimens tested positive for seasonal influenza viruses last week (December 21 to 27, 2025) decreased to 4.97 per cent from 7.81 per cent and 6.17 per cent in the previous two weeks (the baseline level is 4.94 per cent). The influenza admission rate in public hospitals was 0.28 cases per 10 000 population (lower than the 0.49 and 0.37 cases per 10 000 population recorded in the previous two weeks, with the baseline level of 0.27 cases per 10 000 population). Regarding outbreaks of influenza-like illness in schools, the number rose sharply from 15 outbreaks in the first week of the new school year last September to 170 outbreaks in mid-October, before gradually declining to 43 outbreaks in mid-November. After a slight rebound to 71 outbreaks in early December last year, the number has steadily decreased over the past few weeks, falling from over 30 outbreaks per week to just four outbreaks last week. The CHP will continue to closely monitor local surveillance data. Should relevant indicators persistently fall below the baseline levels, the CHP will assess next week whether this summer influenza season has concluded," the Controller of the CHP, Dr Edwin Tsui, said.
The predominant virus circulating during this seasonal influenza season is influenza A (H3) virus strain. As in the past, severe or death cases associated with seasonal influenza primarily affect the elderly and children. As of January 1, this summer influenza season has recorded 25 severe paediatric influenza cases, including three fatal cases. The affected children aged between six months to 17 years old. Among them, 20 cases (80 per cent) had not received SIV (including one case who received the 2025/26 SIV only four days before onset of illness. As it generally takes two weeks for the body to develop sufficient protection after vaccination, the case was not protected by the vaccine. Therefore, it is not counted as vaccinated). During the same period, 502 severe influenza cases were recorded among adults, including 339 deaths. Among adult fatalities with available clinical data, over 80 per cent had underlying illnesses.
"Although the summer influenza season shows signs of ending and the winter influenza season has not yet begun, influenza activity may rise again as the weather gradually turns colder in the first quarter of this year. It cannot be ruled out that the circulating virus strains may change. Therefore, I once again urge all individuals aged six months or older, except those with known contraindications, who have not yet received SIV to act promptly. Although there are some antigenic differences between the currently circulating influenza A (H3) virus strain and the virus strain contained in the vaccine, SIV can still offer protection against the variant strain of subclade K, as well as the influenza A (H1) and influenza B strains included in the vaccine. Those who contracted influenza during the summer influenza season should still receive the 2025/26 SIV, if they have not yet done so, to guard against other circulating virus strains that may emerge during the forthcoming winter influenza season," Dr Tsui added.
2025/26 SIV Programmes
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Getting vaccinated against influenza is one of the most effective ways to prevent influenza and its complications. It also reduces the risk of serious illness or death from infection. With the concerted efforts of all sectors of the community (including the medical sector, schools, parents and residential care homes), as of December 28, 2025, over 1.89 million doses of influenza vaccine were administered under various SIV programmes in the year 2025/26, representing an increase of approximately 4.7 per cent compared with the same period in the previous influenza vaccination season. Regarding schools, to boost SIV rates, enrolment for the SIV School Outreach Programme has started earlier since the beginning of June last year. The CHP has also introduced enhancement measures, allowing all schools to choose either the live attenuated influenza vaccines (i.e. nasal LAIV) and the "hybrid mode", which allows schools to choose both the injectable inactivated influenza vaccines and the nasal LAIV during the same or different outreach vaccination activities. Vaccination rates among schoolchildren in different age groups are two per cent to nine per cent higher compared to the same period last year.
"The SIV coverage rate for children aged six months to under two years remains relatively low at about 22 per cent. Although this represents approximate five per cent point increase compared to the same period last year, it is still lower than that of other age groups. Through the Primary Healthcare Commission, the CHP has urged family doctors to assist in encouraging parents to give consent for their children to receive SIV. The Government has opened all 29 of the DH's Maternal and Child Health Centres (MCHCs) for all children aged six months to under two years to receive the vaccine; as well as the District Health Centres and District Health Centre Expresses and their service outlets under the Primary Healthcare Commission in the 18 districts, and 74 Family Medicine Clinics and 38 public hospitals of the Hospital Authority to provide more choices for the public. For the list of vaccination venues, please refer to the CHP'sVaccination Schemespage. Parents of eligible children may book an appointment for their children to receive vaccination at designated MCHCs via theonline booking system," Dr Tsui said.
He reminded the members of the public to maintain good personal, hand and environmental hygiene. Furthermore, high-risk persons should receive COVID-19 booster doses at appropriate times to lower the risks of serious illness and death. Public with respiratory symptoms, even if the symptoms are mild, should wear a surgical mask and seek medical advice promptly to lower the risk of spreading the disease to high-risk persons.
Members of the public may refer to the CHP'sCOVID-19 & Flu Express,Seasonal Influenza Webpage,COVID-19 Vaccination Programme Webpage, adVaccination Schemes Webpage, for the latest information.
Source: AI-found images
