Objective To detect global infectious disease events occurring outside China in August 2025 and assess the importation risk to China and international travel risk.

Methods Utilizing open-source intelligence on the Internet, this study conducts event-based surveillance of priority infectious diseases and adopts the risk matrix methodology to build an indicator system by integrating disease-, country- and event-specific indicators in terms of transmission likelihood and severity of consequences in order to assess the risk of the importation and the risk of international travel.

Results In August 2025, 14 infectious diseases were detected to form events or outbreaks in 41 countries worldwide. In terms of importation risk to China, there are 6 high-risk events and 25 medium-risk events; in terms of international travel risk, there are 8 high-risk events and 25 medium-risk events.

Conclusion It is recommended to focus on the potential import risks posed by the dengue fever in France and Vietnam, the Severe Fever with Thrombocytopenia Syndrome (SFTS) in South Korea and Japan, and the chikungunya fever in Singapore and France. Regarding overseas travel risks, it is advised that travelers abroad pay close attention to diphtheria in Somalia, the dengue fever in Iran and Vietnam, the SFTS in South Korea and Japan, the yellow fever in Colombia, the cholera in South Sudan, and the chikungunya fever in Singapore. Compared to July, in August, general attention should also be paid to the potential infection risks posed by dengue fever in Nepal, Samoa, Kiribati, and Guatemala; the cholera outbreaks in Ethiopia and Nepal; the West Nile virus disease in Romania, Spain, Greece, Serbia, and France; and the polio in the Democratic Republic of the Congo and the Central African Republic.