The influx of international visitors and large crowds increases the risk of heat-related illnesses, foodborne diseases, and the spread of infectious diseases like measles. Cities like Dallas and Atlanta are particularly vulnerable due to their hot climates and high humidity. Public health officials are also concerned about mosquito-borne illnesses, including West Nile virus and dengue, as well as potential outbreaks of less common diseases like Ebola. The strain on local health departments, compounded by reduced federal assistance, poses challenges in maintaining routine services while addressing these risks.