Chikungunya fever (CHIK) is an acute infectious disease caused by the Chikungunya virus, characterized primarily by fever, joint pain, and rash. It is mainly transmitted through the bites of infected Aedes mosquitoes, most commonly Aedes aegypti and Aedes albopictus. When a mosquito bites an infected person 2-10 days later and then bites another person, it can transmit the virus to the bitten individual.
Transmission Pattern of Chikungunya Fever
The core transmission pattern of Chikungunya fever is “human → mosquito → human.” Most patients are infectious from the day of onset until 7 days after onset, posing a high risk of transmission through mosquito bites. Chikungunya fever can also be transmitted from mother to child and, in rare cases, through blood transfusion or contact with an infected person’s blood. However, the virus does not spread through casual contact or via coughing or sneezing.
Symptoms and Signs After Infection
Infected individuals typically develop symptoms 1-12 days after being bitten by an infected mosquito (most commonly within 3-7 days), with sudden fever and joint pain being the most frequent symptoms. Joint pain is a hallmark feature of Chikungunya fever and may be the first symptom.
How to Diagnose Chikungunya
If a person has visited a Chikungunya-endemic area or lived/worked in an area with reported cases within 12 days before symptom onset and exhibits the aforementioned clinical manifestations (e.g., fever, joint pain, or rash), Chikungunya virus infection should be considered. Laboratory tests are required for confirmation, and differential diagnosis should be made with diseases such as dengue fever and Zika virus infection.
How to Treat Chikungunya Fever
Currently, there is no specific antiviral treatment for Chikungunya fever, and clinical management focuses on symptomatic and supportive care. Physical cooling methods are preferred for fever reduction, and nonsteroidal anti-inflammatory drugs (NSAIDs) such as aspirin (e.g., ibuprofen) should be avoided. For unbearable joint pain during the acute phase, acetaminophen may be used to alleviate symptoms. The use of acetaminophen should follow the principle of the lowest necessary dose and shortest duration.
How to Prevent Chikungunya Fever
The best way to prevent Chikungunya fever is to avoid mosquito bites. The primary methods to reduce Chikungunya virus transmission are vector control and minimizing mosquito breeding.
1
Personal protection: Residents in or near outbreak areas or mosquito-active regions should take personal protective measures, such as wearing light-colored long-sleeved clothing to reduce skin exposure and actively using mosquito coils, repellents, or mosquito nets to repel, eliminate, and prevent mosquitoes. Everyone should take responsibility for their own health.
2
Water management: Eliminate mosquito breeding sites promptly to reduce mosquito density. The mosquito life cycle consists of four stages: egg, larva, pupa, and adult. The first three stages require water, as standing water provides a place for mosquitoes to lay eggs and reproduce. Therefore, standing water should be removed promptly. Water-based plants should have their water completely changed every 3-5 days, with the container walls and plant roots rinsed. Regularly inspect hidden areas such as water trays in water dispensers and refrigerator drip pans to prevent water accumulation. Containers like flower pots, foam boxes, and discarded bottles on balconies, rooftops, or courtyards should be cleaned promptly. Water storage containers such as jars should be covered, and discarded tires should have holes drilled in the bottom or be stored indoors to minimize sanitation blind spots and reduce vector breeding sites.
Common Mosquito Breeding Sites
3
Indoor mosquito control: If adult mosquitoes are found indoors, indoor mosquito control measures should be taken promptly. Use qualified insecticide sprays or mosquito coils to reduce mosquito bites. Physical tools like electric mosquito swatters or mosquito traps can also be used.
4
Travelers should note: Travelers should raise awareness and take self-protective measures to prevent mosquito bites and avoid contracting Chikungunya fever abroad. Within two weeks of returning, continue mosquito bite prevention measures. If symptoms such as fever, headache, muscle/joint pain, or rash appear, seek medical attention promptly and inform the doctor of your travel history. Implement mosquito isolation measures to avoid transmitting the virus to family and friends.
