China is battling its largest recorded outbreak of chikungunya, with provincial health authorities reporting more than 7,700 infections in Guangdong since early July and over 7,000 since June. Ninety-six percent of recent cases are concentrated in Foshan’s Shunde district, although officials say daily new infections have fallen for eight consecutive days. To curb transmission of the mosquito-borne virus, Guangdong has reinstated some pandemic-era controls. Measures include mandatory hospital stays under mosquito nets for confirmed patients, real-name registration for purchases of fever medication, community disinfection drives and door-to-door inspections for stagnant water. Local governments have released mosquito-eating fish, deployed drones to locate breeding sites and threatened fines of up to 10,000 yuan (about US$1,400) or electricity cut-offs for non-compliance. The U.S. Centers for Disease Control and Prevention on 1 August issued a Level 2 travel alert advising enhanced precautions for travelers to Guangdong; similar notices cover Bolivia and several Indian Ocean islands. Worldwide, the European Centre for Disease Prevention and Control counts roughly 240,000 chikungunya cases and 90 deaths so far this year. Chinese officials say the provincial response, combined with drier weather expected later in August, should keep the outbreak “preventable, controllable and treatable.” Public-health experts warn, however, that heavy rainfall and high temperatures continue to favor Aedes mosquito populations, leaving the region vulnerable to further flare-ups.