Latest Situation of Chikungunya Fever
According to data released by the Centre for Health Protection, as of October 25, 2025, Hong Kong has recorded a total of 47 cases of chikungunya fever, including the first locally confirmed case.
The patient is an 82‑year‑old woman living in Fung Tak Estate, Diamond Hill, who developed fever and joint pain on October 18 and had no travel history during the incubation period.
The remaining 46 cases are imported, with 440 originating from Mainland China, indicating that cross‑border transmission is still ongoing.
According to the Food and Environmental Hygiene Department’s latest “Ovitrap Index” for September 2025, the average Aedes albopictus ovitrap index across 64 surveillance areas in Hong Kong was 2.5% (Grade I, not widespread), showing a significant decrease from 5.3% in August.
However, relatively higher readings were recorded in areas such as Lok Fu West in Kowloon City and Shau Kei Wan in Eastern District, suggesting that stagnant‑water breeding risks still exist in certain locations. Besides the government’s intensified mosquito control efforts, what can individuals and businesses do to prevent mosquito‑borne diseases?
What is Chikungunya Fever?
Chikungunya Fever is a viral disease transmitted by mosquitoes. It first appeared in Tanzania, Africa in 1952. Its name comes from the Makonde language, meaning “bent over in pain,” describing patients bending over due to severe joint pain. To date, Chikungunya Fever cases have been reported in over 110 countries and regions globally, spreading from Africa and the Americas to Asia, Europe, and beyond. It belongs to common mosquito-borne viruses like Dengue Fever, Japanese Encephalitis, Zika and Malaria, sharing similar transmission sources and symptoms.
Transmission of Chikungunya Fever: Hong Kong The Most Common Mosquito — the Aedes albopictus
Chikungunya fever is mainly transmitted to humans through bites from Aedes aegypti and Aedes albopictus (commonly known as the Asian tiger mosquito), rather than through direct person‑to‑person contact.
Aedes albopictus is the predominant mosquito species in Hong Kong. They:
- Are active during the daytime (with peak activity at dawn and dusk)
- Prefer to lay eggs in stagnant‑water containers (such as plant saucers and drains)
- Require only a small amount of water to breed
- Are aggressive and tend to bite humans and animals repeatedly
This is precisely why dengue fever, Zika, and chikungunya fever can easily spread in urban areas.
Symptoms and Incubation Period of Chikungunya Fever
As a common mosquito-borne virus, the initial symptoms of Chikungunya Fever are very similar to Dengue Fever. The incubation period ranges from 2 to 12 days, and infected individuals typically experience the following common symptoms:
- Fever (above 39°C)
- Severe joint pain
- Muscle aches, headaches, fatigue
- Nausea
- Skin rash
However, the intense joint pain caused by Chikungunya Fever is more pronounced, especially in small joints like wrists, knees, ankles, and fingers. The severe pain can last for several days to weeks. Since these symptoms resemble common cold symptoms, many patients may not notice them initially, leading to delayed medical attention and testing, increasing the risk of community transmission.
Which places are prone to mosquito-borne hotspots?
In daily life and work environments, the following locations are particularly prone to becoming potential mosquito breeding grounds:
- Rooftop water accumulation and unsealed air-conditioner drainage outlets — especially during the rainy season or in humid weather, rooftops can easily collect rainwater, and poorly sealed drainage outlets may become mosquito breeding sites.
- Green walls and outdoor planters — many venues use plants and potted flowers to beautify the surroundings, but if stagnant water is not promptly cleared or treated, these areas can easily become mosquito breeding grounds.
- Construction sites with standing water — due to stacked materials, it may be difficult to detect or promptly remove containers or leaking sources that hold stagnant water, allowing adult mosquitoes to access water surfaces for breeding.
In addition, outdoor workers such as property management personnel and delivery couriers spend long hours in high-risk areas, increasing their exposure risk.
Chikungunya Fever Prevention Measures
Chikungunya fever is a mosquito-borne disease. Mosquitoes can become infected within as little as 2 to 4 days. In addition to transmitting the virus through their saliva when biting humans, they can also pass it to their offspring. The most effective way to prevent virus transmission is to avoid mosquito bites and implement thorough mosquito prevention and control measures.
Personal prevention:
- To prevent mosquito bites, wear loose-fitting, light-colored long-sleeved shirts and long trousers.
- Apply insect repellent containing DEET on exposed skin and clothing.
- Avoid staying outdoors during peak activity periods of Aedes albopictus (early morning and dusk).
- Remove stagnant water and replace water in flower vases or plant containers at least once a week.
Corporate mosquito control and environmental measures:
- Remove sources of stagnant water such as air-conditioner drip trays, plant saucers, planter boxes, open drains, and drain covers to eliminate mosquito breeding grounds.
- Carry out regular mosquito control and disinfection by partnering with professional pest control companies for thorough treatment.
- Conduct regular inspections of indoor and outdoor areas to check for stagnant water spots and maintain a clean environment.
- Provide staff training to raise mosquito prevention awareness and reduce infection risks.
Most Effective Mosquito Control Methods
70 Years of Expertise: Professional Strategies to Eliminate Mosquitoes at the Source
When mosquito problems persist, personal precautions alone are not enough to completely eliminate the issue.
With over 70 years of pest control experience, Johnson Group understands the importance of tackling mosquito infestations from the root cause.
Our professional mosquito control strategies include:
| Mosquito Control Service | Features | Application Scene |
| Cold Fog Treatment | Uses ultra-low volume electric sprayers to atomize insecticide into fine mist droplets, effectively killing adult mosquitoes and flying insects on contact. | Indoor and outdoor landscaped areas |
| Application of Mosquito Larvicide Sand / Eco-friendly Anti-Mosquito Film | In situations where some stagnant water cannot be removed, or where water must remain, mosquito larvicide sand or eco-friendly anti-mosquito film is applied to kill mosquito eggs and larvae, effectively controlling their breeding population. | Stagnant water, drains, and gully openings |
Johnson Group Mosquito Control Service
The professional team at Johnson Group can tailor mosquito prevention and control solutions according to your environment and needs.
We use a series of chemical and preventive methods to eliminate mosquito breeding in stagnant water and exterminate mosquito larvae,
while prioritizing the use of non-toxic and harmless mosquito control products.
Mosquito Control Product Recommendations
Besides professional mosquito control services, choosing suitable mosquito prevention products can greatly reduce mosquito breeding and bite risks. Johnson Group has carefully selected multiple highly effective and safe mosquito control solutions to comprehensively protect your home and workplace environment.
1) Environmental Mosquito Prevention and Blocking Mosquito Egg Breeding
2) Mosquito Killer – Continuous Flying Insect Control
3) Immediate Mosquito Elimination and Rapid Protection
This content is compiled based on data from the CHP, the WHO and Johnson Group service case data. It is for general information and protective education only. If suspected infection symptoms appear, please seek medical attention immediately.
