Public health experts are preparing for a heightened disease-surveillance effort around the World Cup, with Philadelphia Deputy Health Commissioner Garrow saying routine monitoring will continue every day, but the tournament will require far more intense vigilance. Among the biggest concerns is not an exotic outbreak, but measles, which officials say could spread quickly in packed stadiums and fan festivals if an infected traveler is present. Garrow said local health authorities have already alerted regional healthcare providers about what symptoms to watch for, as recent U.S. outbreaks, lower vaccination rates, and international travel raise the likelihood of exposure.
Measles is especially worrying because it can linger in the air for up to two hours after an infected person leaves a space, creating risk in crowded venues where thousands of fans move through entrances, concourses, and shared seating areas. Health experts say the World Cup should be viewed as a mass-gathering event, where diseases associated with crowds are the most likely to circulate. Those illnesses generally fall into four main groups: respiratory infections, sexually transmitted infections, vector-borne diseases, and gastrointestinal illnesses.
Despite headlines about Ebola in the Democratic Republic of the Congo, specialists say the risk to the general public in North America is very low. Experts note that Ebola spreads through direct contact with bodily fluids, not through casual proximity in a stadium or on public transit. That means a person sitting near an infected individual would not be expected to contract Ebola simply by sharing a seat or attending a match. While the global health community remains concerned about the outbreak, doctors do not expect World Cup-related cases.
More likely, experts say, are common respiratory viruses such as COVID-19, respiratory syncytial virus, and influenza. Even though flu is often associated with winter in the United States, experts note that influenza season in the Southern Hemisphere could mean international travelers arrive carrying the virus. Some may be contagious before they even realize they are sick, allowing infections to spread on airplanes, in hotels, and at crowded events.
Gastrointestinal viruses are also a concern at large sporting events. Norovirus, which is highly contagious and spreads rapidly in close quarters, has historically caused outbreaks during major international gatherings, including previous Olympic Games. Public health specialists say similar patterns could emerge around the World Cup, where fans from many countries share transportation, food venues, and public spaces over an extended period.
Medical experts also expect sexually transmitted infections to be among the infections that “show up” during the tournament environment, along with other crowd-related illnesses. Overall, the message from public health officials is that the World Cup is not just a sporting event, but also a temporary city of millions of visitors, making surveillance, communication, and rapid response essential to limit disease spread.
