CHP Urges Public to Prevent Dengue and Chikungunya as Weather Favors Mosquito Breeding

Update on mosquito-borne diseases, dengue fever and chikungunya fever

The Centre for Health Protection (CHP) of the Department of Health today (October 2) announced the latest situation regarding dengue fever (DF) and chikungunya fever (CF). Although Hong Kong has entered autumn, the weather has yet to cool down and the rainy season has not yet ended, thus favourable for mosquito breeding. Members of the public are reminded to take appropriate measures to prevent mosquito bites and mosquito breeding, both in Hong Kong and when travelling to areas affected by mosquito-borne diseases, in order to prevent mosquito-borne diseases.

Dengue fever

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From September 25 to yesterday (October 1), no new cases of DF had been recorded.Hong Kong has recorded 32 DF cases so far this year, comprising 30 imported cases and two local cases. A total of 59 DF cases were recorded last year (2025), all of which were imported cases. In 2024, 161 DF cases were recorded, comprising 156 imported cases and five local cases.

According to the World Health Organization (WHO), the global incidence of DF has markedly increased over the past two decades, posing a substantial public health challenge. In 2024, the WHO recorded over 14 million DF cases, which was a record number. In 2025, over five million cases and over 4 000 DF-related deaths were reported in over 90 countries/territories. From January to August 2026, around 2.2 million cases and over 1 000 DF-related deaths have been recorded globally.

DF has long been prevalent in many neighbouring tourist destinations. So far this year, Sri Lanka and Vietnam each recorded over 100 000 cases; Bangladesh and Cambodia each recorded over 80 000 cases; Indonesia and Malaysia each recorded over 70 000 cases; and Singapore recorded over 2 500 cases. Meanwhile, according to the Guangdong Provincial Disease Control and Prevention Administration, as of August 31, 2026, Guangdong Province has recorded 431 cases, of which 150 were recorded in August.

Detailed information on the latest DF situation in Hong Kong, as well as neighbouring and overseas countries and areas, has been uploaded to the CHP'swebsite.

Chikungunya fever

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From September 25 to yesterday, the CHP recorded one imported CF case, involving a 62-year-old female. The patient had visited Guangdong Province during the incubation period. The CHP considered that she was infected during travel. The case was classified as an imported case. The patient has been admitted to the hospital for treatment in a mosquito-free environment and is in stable condition.She has two household contacts who are currently asymptomatic and under medical surveillance. The CHP's epidemiological investigation is ongoing. The case has been reported to the health authority of Guangdong Province.

Hong Kong has recorded four confirmed CF cases so far this year, including three imported cases and one local case. Hong Kong recorded a total of 82 confirmed CF cases last year. Among them, 11 were local cases and the rest were imported cases.

According to the WHO, a total of 502 264 CF cases and 186 CF-related deaths were reported in 41 countries/territories last year. Cases were reported in the Americas, Africa, Asia and Europe. According to the Guangdong Provincial Disease Control and Prevention Administration, as of August 31, 2026, Guangdong Province has recorded 739 cases, with 496 recorded in August, a sharp increase from the 36 and 171 cases recorded in June and July respectively.

Preventive measures to be taken by the public

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The CHP reminds members of the public to maintain good environmental hygiene, and to take appropriate measures to prevent mosquito bites and mosquito breeding, both in Hong Kong and when travelling to areas affected by mosquito-borne diseases, in order to prevent mosquito-borne diseases. Mosquito-borne diseases such as DF and CF are endemic in various countries worldwide. The risk of importation persists. Members of the public should check the situation at their destinations before travelling abroad, especially when travelling to Southeast Asian countries. Additionally, whether travelling or not, members of the public should use DEET-containing insect repellents or other effective active ingredients properly to 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 Food and Environmental Hygiene Department (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, and properly disposing of containers such as empty cans and lunch boxes. The FEHD also advises members of the public and property management agencies 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.

The Centre for Health Protection, Photo source: reference image

Employers, contractors and employees should be aware of electrical safety at work during rainstorms

As the rainstorm warning has been issued by the Hong Kong Observatory, the Labour Department (LD) reminds employers and contractors that they should adopt necessary work arrangements and take suitable safety measures to protect the safety of their employees when they are carrying out electrical work or handling electrical plant.

A spokesman for the LD said today (October 4) that employers and contractors should avoid assigning employees to carry out electrical work (such as electric arc welding work) or handle electrical plant at places affected by rainstorms, and should refer to the "Code of Practice in Times of Adverse Weather and 'Extreme Conditions'" and the "Guide on Safety at Work in times of Inclement Weather" issued by the LD.

Even if electrical work is carried out or electrical plant is handled at places not affected by a rainstorm, suitable safety measures must still be adopted to prevent an electric shock as the air would be more humid. Such measures include:

(i) Ensure that all live parts of an electrical installation are isolated from the power supply source and rendered dead, and the isolation from the power supply source must be maintained as long as electrical work is being carried out;

(ii) Before carrying out any electrical work or handling any electrical plant, cut off and lock out the power supply source, then test the circuit concerned to confirm that it is dead and display suitable warning notices, and issue a work permit thereafter;

(iii) Ensure that protective devices (such as suitable and adequate fuses and circuit breakers) for the electrical installations or electrical plant have been installed and maintained in good working order, and portable electric tools must be double-insulated or properly earthed;

(iv) Provide suitable personal protective equipment such as insulating gloves and insulating mats for employees; and

(v) If live electrical work is unavoidable, a comprehensive risk assessment should be conducted by a competent person and the appropriate safety precautions should be taken to remove or properly control the electrical hazards involved before such work can proceed.

In addition, employees should co-operate with the employer or contractor to follow the safety instructions and use the safety equipment provided.

The LD has published guidebooks and leaflets on electrical work safety. These safety publications are available free from divisional offices of the department or can be downloaded from its website (www.labour.gov.hk/eng/public/content2_8.htm).

Should there be any questions about occupational safety and health matters, please contact the Occupational Safety Officer of the LD at 2559 2297.

Source: AI-found images