The Pan American Health Organization issued new health recommendations for travelers attending the 2026 FIFA World Cup on June 8, and the most striking element is not what it says about Mexico or Canada — it is what it says about the United States [1].

PAHO's "With Health, We All Win" campaign specifically warns that measles is "highly contagious" and that "the risk of transmission increases in crowded environments" — language typically reserved for outbreaks in developing countries, not World Cup host nations [1]. The advisory recommends that all travelers ensure they have two doses of measles-rubella vaccine before attending matches.

The United States has crossed 2,030 confirmed measles cases in 2026, a figure that would have been unthinkable five years ago when the disease was declared eliminated domestically [2]. Mexico has recorded 10,920 cases and 13 deaths. Guatemala has 6,209 cases and 12 deaths. Canada has 1,018 cases.

But the framing has inverted. The WHO and PAHO have traditionally warned travelers from the Americas about risks in Africa and Asia. Now the advisory warns travelers to the Americas about risks in the United States [1]. A single infectious person can spread measles to up to 18 unprotected individuals in a crowded environment. Stadiums and fan zones are high-risk settings.

The checklist is more useful than the case count. PAHO recommends updating vaccinations, carrying a basic health kit, and monitoring symptoms for 7 to 14 days after returning home [1]. For World Cup attendees, the practical question is not how many Americans have measles — it is whether the stadium next to them is safe.

-- NORA WHITFIELD, Chicago