China is confronting an outbreak of the mosquito-borne chikungunya virus, with over 7,700 cases reported primarily in Guangdong province since early July 2025. The virus causes fever, severe joint and muscle pain, and is transmitted by mosquitoes. In response, authorities in Guangdong, particularly in Foshan city and the Shunde district, have implemented extensive measures including the release of mosquito-eating fish, citywide cleanup campaigns, chemical spraying, drone surveillance of mosquito breeding sites, and real-name registration for fever and pain relief medication purchases. These efforts have led to a decline in daily new cases in affected areas. The outbreak has prompted China to reinstate some Covid-era health controls and mobilize health resources in a manner not seen since the pandemic. The U.S. Centers for Disease Control and Prevention (CDC) has issued a Level 2 travel advisory for China, warning travelers to take enhanced precautions amid the outbreak. Globally, chikungunya infections have reached approximately 240,000 cases. Hong Kong has also reported several imported cases linked to the outbreak in mainland China. Despite the virus not being transmissible from person to person, the scale of the outbreak and its spread across at least 13 Chinese cities have led to heightened public health responses and international travel warnings.