What to know about chikungunya virus, as U.S. travel alerts issued
The big picture: At least 240,000 chikungunya cases have been reported in parts of Central and South America, Africa, the Indian Ocean region and Asia this year — with health officials in Guangdong province, South China, confirming 7,000 since June.
What are the symptoms of chikungunya virus?
The painful viral disease is spread to people by infected female mosquitoes that can also transmit dengue and Zika viruses, per the World Health Organization.
"The most common symptoms of chikungunya are fever and joint pain," per the Centers for Disease Control and Prevention.
"Other symptoms can include headache, muscle pain, joint swelling, or rash."
Which countries has the CDC issued travel alerts for?
The CDC has issued level 2 "practice enhanced precautions" chikungunya travel health notices over outbreaks in :
Bolivia, South America.
Guangdong Province, China.
The Indian Ocean region of Madagascar, Mauritius, Mayotte, Réunion, Somalia and Sri Lanka.
Of note: The CDC warns of an elevated risk of exposure for U.S. travelers visiting Brazil, Colombia, India, Mexico, Nigeria, Pakistan, the Philippines and Thailand.
What's happening in China?
Most of the chikungunya illnesses have been reported in Foshan, a Guangdong Province city of about 7.8 million people.
The first case was reported in the financial hub of Hong Kong on Monday.
Officials have launched a " patriotic public health campaign" in response that the New York Times notes is triggering memories of crackdowns during the COVID pandemic.
Zoom in: Foshan crews have been spraying people with insect repellent before letting them in to building entrances, home inspectors have ordered residents to discard stagnant water, per the NYT.
Anyone who doesn't comply may be criminally charged for "obstructing the prevention of infectious diseases," and some Guicheng district households have had their power cut.
Meanwhile, drones have been launched to detect potential mosquito-breeding sites in sources of stagnant water.
Thousands of mosquito-larvae eating fish and cannibal"elephant mosquitoes" that can consume smaller, chikungunya-spreading insects have also been deployed.
Is chikungunya common in the U.S.?
"Locally acquired chikungunya cases have not been reported from U.S. states or territories since 2019," per the CDC.
Yes, but: There were 199 travel-associated reports in the U.S. in 2024 and 46 this year, according to the health agency.
What precautions should U.S. travelers take?
The CDC level 2 alerts advise travelers to affected regions to take enhanced precautions such as using insect repellent, wearing long-sleeved shirts and pants and staying in places with air conditioning or that have screens on the windows and doors.
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