Update on chikungunya fever
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Latest case information
The two cases involve a 79-year-old female and a 75-year-old male, both living in Sha Tin District. They visited Panyu District in Guangzhou from August 30 to September 6. On September 9, they developed a fever, headache and joint pain. The female patient also developed a rash. They attended General Out-patient Clinics yesterday (September 10) and were subsequently transferred to Prince of Wales Hospital. They were admitted for treatment in a mosquito-free environment and are now in stable condition. Their blood samples tested positive for the CF virus upon laboratory testing.
They have one household contact, who did not travel to Guangzhou with them. This household contact is currently asymptomatic and under medical surveillance.
Since the two patients stayed in Guangzhou during their incubation periods, the CHP considered that they were infected during travel. The cases were classified as imported. The CHP's epidemiological investigation is ongoing, and it has reported the cases to the health authority of Guangdong Province.
So far this year, Hong Kong has recorded a total of 16 confirmed CF cases. All are imported cases. From 2016 to 2019, Hong Kong recorded between one and 11 imported cases annually.
From January to July this year, more than 240 000 cases were recorded in 16 countries/regions worldwide, including about 90 deaths. In Asia, India and Indonesia recorded more than 32 000 and 17 000 cases respectively in 2025. Other regions that have recorded CF cases include the Mainland, Bangladesh and Sri Lanka, etc. Although the situation in Guangdong Province has been under control since late August, with only sporadic new cases reported each day, CF outbreaks continue in many countries worldwide. Members of the public should check the situation of the destinations before travelling abroad.
Continuously strengthening prevention and control
The Food and Environmental Hygiene Department (FEHD) continues to conduct vector investigations and targeted mosquito control operations, and intensify mosquito prevention and control measures at the residences of recently confirmed patients, as well as at locations visited after the onset of symptoms. These measures include:
- carrying out intensive fogging in scrubby areas within a 250-metre radius of the relevant locations to kill adult mosquitoes;
- carrying out inspections of the locations, removing stagnant water, applying insecticides and disposing of abandoned water containers every week with a view to preventing mosquito breeding; and
- enhancing public education efforts through organising health talks, setting up mobile education stations, and distributing publicity leaflets.
The CHP urged schools to follow the FEHD's anti-mosquito guidelines to strengthen efforts to clear stagnant water on school premises and eliminate mosquito breeding sites. It is also imperative to remind staff members and students to consistently implement mosquito prevention and personal protective measures to guard against the spread of mosquito-borne diseases within school premises.
Additionally, the CHP's Port Health Division continues to step up inspections at boundary control points and to remind cross-boundary public transport operators and other relevant parties to ensure good environmental hygiene and effective implementation of anti-mosquito measures. Furthermore, staff members of the Port Health Division distribute leaflets to travellers, conduct temperature screenings for inbound travellers, conduct health assessments for travellers with fever or related symptoms and refer them to hospitals for follow-ups when necessary.
Proper use of DEET-containing insect repellents or other effective active ingredients can prevent mosquito bites, but the following precautions should be taken when using them:
- read the label instructions carefully first;
- apply right before entering an area with a risk of mosquito bites;
- apply on exposed skin and clothing;
- use DEET of up to 30 per cent for pregnant women and up to 10 per cent for children (For children who travel to countries or areas where mosquito-borne diseases are endemic or epidemic and where exposure is likely, those aged 2 months or above can use DEET-containing insect repellents with a DEET concentration of up to 30 per cent);
- apply sunscreen first, then insect repellent;
- reapply only when needed and follow the instructions; and
- in addition to DEET, there are other insect repellents available on the market containing different active ingredients, such as IR3535 and picaridin. When using any insect repellent, the public should follow the usage instructions and precautions on the product label.
The FEHD also 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, and properly disposing of containers such as soft drink cans and lunch boxes. 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.
The public should call 1823 in case of mosquito problems, and may visit the following pages for more information: the CF page of the CHP and the Travel Health Service, the latest Travel Health News, tips for using insect repellents, and the CHP Facebook Page, Instagram Account and YouTube Channel, and also the Mosquito Prevention and Control dedicated page of the FEHD.
Ends/Thursday, September 11, 2025
Issued at HKT 19:35
Issued at HKT 19:35
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