Hong Kong’s Centre for Health Protection (CHP) confirmed two new imported cases of Chikungunya fever Wednesday, underscoring the risk of mosquito-borne illnesses for travelers returning from affected regions, particularly mainland China. Both cases involve middle-aged women who recently visited destinations in Guangdong Province and developed symptoms shortly after their return.
The first patient, a 53-year-old woman residing in Cheung Hang Estate, Tsing Yi, traveled to Zhongshan, Guangdong, between November 2 and 4. She sought emergency care at Princess Margaret Hospital on Tuesday after experiencing joint pain, a rash since Monday, and a subsequent fever.
The second confirmed case is a 60-year-old woman from Greenview Garden, Tsing Yi, who had visited Shenzhen, Guangdong, on November 17. She presented to the Yan Chai Hospital emergency department on Tuesday after developing joint pain on Monday, followed by a rash the next day.
Blood tests for both women confirmed the presence of the Chikungunya virus. Health authorities reported that both patients are in stable condition and have been admitted for isolation and treatment in a mosquito-free environment.
Contact Tracing and Medical Surveillance Underway
Preliminary epidemiological investigations suggest both infections were acquired abroad, classifying them as imported cases. The CHP is coordinating with Guangdong health authorities regarding the findings.
In the 53-year-old patient’s case, three household contacts and five travel companions who went to Zhongshan are being monitored, though none currently show symptoms. For the 60-year-old patient, two household contacts and a travel partner who accompanied her to Shenzhen are under medical surveillance. Crucially, one individual from the latter group, who exhibits minor joint pain, has been referred to an emergency department for testing.
Understanding Chikungunya and Travel Risks
Chikungunya fever is transmitted through the bite of infected Aedes mosquitoes. While rarely fatal, the disease is characterized by sudden onset of fever and severe joint pain, often lasting weeks or months.
This recent detection highlights the constant vigilance required against vector-borne diseases in a globalized city like Hong Kong. The CHP urges travelers returning from endemic areas to remain vigilant for symptoms such as rash, fever, and persistent joint pain, and to seek immediate medical attention if they arise.
Separate Imported Dengue Fever Case Noted
In a separate announcement, the CHP also reported one imported case of Dengue fever recorded between November 14 and Tuesday. The patient had a travel history to India during the incubation period.
The recent case brings the total number of imported Dengue fever infections in Hong Kong this year to 54. Health data up to Tuesday indicates a total of 161 Dengue fever cases have been recorded in 2024, comprising 156 imported cases and five locally acquired infections.
Preventive Measures for Travelers:
- Apply Repellent: Use insect repellent containing DEET, Picaridin, or IR3535 on exposed skin.
- Protective Clothing: Wear long-sleeved shirts and long trousers.
- Secure Living Spaces: Ensure windows and doors are fitted with effective screens, especially when staying in rural or less developed areas.
- Eliminate Standing Water: Prevent mosquito breeding by removing stagnant water sources both indoors and outdoors.
The CHP continues its epidemiological investigation to ensure all potential vectors and contacts are identified and managed appropriately.
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