Objective To detect global infectious disease events occurring outside China in November 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 November 2025, 14 infectious diseases were detected to form events or outbreaks in 37 countries worldwide. In terms of importation risk to China, there are 1 high-risk events and 11 medium-risk events; in terms of international travel risk, there are 5 high-risk events and 26 medium-risk events.

Conclusion It is recommended to focus on the potential import risks posed by the Marburg hemorrhagic fever in Ethiopia. Regarding overseas travel risks, it is advised that travelers pay close attention to diphtheria in Somalia, the dengue fever in Vietnam, the yellow fever in Colombia, the cholera in South Sudan, the Marburg hemorrhagic fever in Ethiopia. Compared to October, in November, general attention should also be paid to the potential infection risks posed by diphtheria in Lithuania and Yemen; the dengue fever in Afghanistan, Pakistan, Singapore, Yemen, and Vietnam; the Severe fever with thrombocytopenia syndrome(SFTS) in South Korea, the yellow fever in Brazil; the cholera in Haiti and Mozambique; the chikungunya fever in France, Cuba, and Italy; the Rift Valley fever in Gambia and Senegal; and the human avian influenza in Cambodia and the United States.