The upcoming 2026 FIFA World Cup, hosted across 16 cities in the United States, Canada, and Mexico, presents ideal conditions for the spread of infectious diseases due to massive international travel and crowded venues.

• Health experts are monitoring threats including respiratory infections like measles (with 2,030 cases in the U.S. by June 4, 2026), flu, and Covid-19, alongside mosquito-borne illnesses such as dengue and yellow fever.
• While dramatic outbreaks like Ebola are unlikely due to strict travel restrictions, the sheer volume of attendees increases the probability of common infections spreading.
• The event also poses a risk for a rise in sexually transmitted infections, with nearly half of casual encounters among international travelers being unprotected.