Whether you need the Japanese Encephalitis (JE) vaccine for a trip to Chengdu depends largely on your length of stay, planned activities, and the time of year you are visiting. While the CDC and WHO generally recommend the vaccine for travelers to China, it is not typically required for short-term tourist or business trips restricted to major urban centers like Chengdu. The risk of JE is highest in rural, agricultural, or rice-farming regions where mosquitoes are more prevalent, particularly during the peak transmission season from May to October. Medical experts suggest considering the vaccine if you plan to stay in the region for more than one month, intend to visit rural areas outside the city, or expect to spend significant time outdoors where mosquito exposure is likely. Because cases have been reported in nearly all Chinese provinces except Tibet, Xinjiang, and Qinghai, travelers planning extensive rural exploration or long-term residence in Sichuan Province are encouraged to consult a healthcare provider to determine if the vaccine is appropriate for their specific itinerary. Regardless of vaccination status, all visitors should practice mosquito avoidance by using repellent and wearing protective clothing.