FIFA World Cup Expects Millions, Raising Infectious Disease Concerns for Health Officials

The FIFA World Cup 2026 kicked off June 11 at Mexico City's Estadio Azteca — and with 6.5 million fans expected across 16 host cities, public health officials are bracing for something beyond soccer: a wave of infectious disease. The tournament, the largest in FIFA history, spans 48 countries and 104 matches over 39 days, creating what epidemiologists are calling a "large-scale natural experiment in pathogen redistribution," according to CIDRAP.
Measles is the top concern. The U.S. has already logged over 2,030 confirmed cases in 2026 as of June 4 — nearly matching all of last year's total of 2,228 — according to The Guardian. Millions of international visitors from countries with lower vaccination rates are now mixing in packed stadiums, fan zones, and shared bathrooms.
Measles is so contagious it can linger in the air for up to two hours after an infected person leaves the room. "Measles is what I'm most worried about," said Dr. Krutika Kuppalli, an infectious disease physician at UT Southwestern, according to The Washington Post. Philadelphia's Deputy Health Commissioner James Garrow echoed that fear: "Measles is probably our top worry... We've already put out communications to regional healthcare providers," per CIDRAP.
The Pan American Health Organization issued a formal warning in early June about a "sustained increase" in measles across the Americas, according to PAHO. Ninety-five percent of recent cases involved unvaccinated people. Beyond measles, experts flag norovirus, influenza, dengue, and sexually transmitted infections as high-probability risks at mass gatherings. A 2010 Vancouver Olympics measles scare turned two imported cases into 82 infections across British Columbia, per Georgetown University.
On May 28, a major Ebola outbreak in the Democratic Republic of the Congo was declared a global health emergency, raising fresh concerns about importation via international travelers, according to Forbes. Meanwhile, 14 of the 16 host venues are projected to hit dangerous heat levels during match times, according to Virus Watcher. FIFA's ban on reusable water bottles inside stadiums — forcing fans to buy single-use sealed bottles — has drawn sharp criticism as a policy that increases heatstroke risk.
The federal government allocated $625 million for World Cup security — covering anti-drone tech and law enforcement — but exactly $0 of that went to public health, according to FEMA. That gap has stunned experts. Dr. Ziad Memish, a global health security veteran, warned: "When you have too many independent partners working independently, that's not going to fly," per Georgetown University.
With the CDC weakened by federal staffing cuts and the U.S. having withdrawn from the World Health Organization, local health departments are largely on their own, according to MedPage Today. To fill the void, Georgetown University launched the Health Security Operations Center (HSOC) on June 1 — an independent, non-governmental disease monitoring hub. Director Rebecca Katz described it as standing up "a non-governmental public health emergency operations center... to address an unmet need."
On May 15, Verily Health teamed up with Georgetown and MedStar Health to launch a private wastewater monitoring dashboard called Sightline. Wastewater testing tracks signs of viruses in sewage before hospitals see a surge in patients — an early warning system. As of June 12, the dashboards are still in "final development," according to PBS News. If the model works, it could become the blueprint for the 2028 Los Angeles Olympics.
Philadelphia Health Commissioner Palak Raval-Nelson put it plainly: "This is truly a marathon." Her city is one of 11 U.S. hosts managing the surge, from staffing clinics to alerting hospitals to watch for diseases like malaria or dengue that local doctors rarely see, per Northeastern Global News. Rep. Nellie Pou is pushing for a guarantee that immigration enforcement won't happen at fan zones — fearing sick visitors will avoid hospitals out of fear of arrest.
The economic stakes are high — FIFA projects a $30 billion national boost — but independent economists warn those numbers are likely "exaggerated," according to KERA News. The World Cup Final is set for July 19 in New York/New Jersey. Between now and then, 6.5 million fans will pass through airports, stadiums, and shared spaces. Health officials say the real test isn't who wins on the field — it's what spreads in the stands.
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