China is confronting its largest recorded outbreak of the chikungunya virus, primarily concentrated in Guangdong Province's Foshan city. Since mid-June, nearly 8,000 cases have been reported across at least 13 cities, with more than 7,000 cases recorded since July alone. The virus, transmitted by mosquitoes, causes symptoms such as fever, joint pain, and rash, although fatalities are rare. In response, Chinese authorities have implemented strict containment measures reminiscent of Covid-19 protocols, including quarantine hospitalizations, patient isolation, and widespread chemical spraying to control mosquito populations. An unconventional tactic involving the release of large carnivorous mosquitoes has also been deployed. These efforts have led to a decline in new cases, with weekly infections dropping from nearly 3,000 to 1,387 in the latest reporting period. Over 90% of patients in Foshan have recovered. The National Disease Control and Prevention Administration introduced a four-tier risk classification system for infectious diseases and designated South China's Guangxi Zhuang Autonomous Region as a Category I risk area for chikungunya. Meanwhile, the United States Centers for Disease Control and Prevention (CDC) issued a Level 2 travel advisory for China due to the outbreak, warning of potential isolated outbreaks in the U.S. but assessing the overall risk as low. The outbreak has also raised health alerts in neighboring regions such as Hong Kong. Concurrently, mosquito-borne West Nile virus cases have been reported in parts of the U.S., including Illinois, Massachusetts, and New York, with health officials urging precautions as peak mosquito season continues.