United States fans go through security checks as they arrive to watch training for FIFA World Cup 2026 in Irvine, California, US, June 8, 2026. [Photo/Agencies]

As millions of international fans head to US cities for the 2026 FIFA World Cup, public health experts are warning about measles outbreaks and Ebola risks.

When the 2026 FIFA World Cup begins on June 11, 2026, matches will be played across 16 cities in the United States, Canada and Mexico.