The Centers for Disease Control and Prevention (CDC) has issued a travel advisory concerning the resurgence of poliovirus in 32 countries worldwide. This development highlights a growing global health concern as vaccination rates decline, potentially reversing decades of progress against this debilitating disease.
Global Polio Resurgence
The affected regions include parts of Europe – such as the United Kingdom, Germany, Poland, Spain, and Finland – as well as areas in Africa (including Tanzania) and the Eastern Mediterranean (including Israel and Afghanistan). The CDC advises travelers to these destinations to ensure they are fully vaccinated against polio, with booster shots recommended even for those who completed the initial vaccine series.
Experts emphasize that while the risk to fully vaccinated individuals is exceptionally low, the decline in global immunization rates is increasing the potential for outbreaks. “If you are fully vaccinated, your risk is extremely low — near zero — of getting a polio infection,” explains Dr. Robert H. Hopkins Jr., medical director of the National Foundation for Infectious Diseases (NFID). However, the broader trend is concerning.
Why Polio Remains a Threat
Polio is a highly contagious disease spread through fecal contamination and contaminated water or food. While most infections are asymptomatic, roughly 1 in 200 cases result in irreversible paralysis, with 5–10% of paralyzed individuals dying due to respiratory failure, according to the World Health Organization (WHO). There is no cure for polio; prevention through vaccination remains the only effective defense.
The United States eliminated polio through widespread vaccination efforts, with no indigenous cases reported since 1979. However, declining vaccination rates worldwide pose a risk of reintroduction, particularly from unvaccinated travelers bringing the virus back to their communities.
Vaccine Hesitancy and Declining Rates
Vaccine hesitancy, fueled by misinformation, distrust in institutions, and cultural beliefs, is driving down immunization rates globally. CDC data shows that polio vaccination among kindergartners fell to 92.5% in the 2024–25 school year. Disturbingly, some influential CDC advisors now suggest presenting polio vaccination as a personal choice rather than a routine recommendation, potentially accelerating this decline.
Experts warn that if this trend continues, the U.S. could lose its polio-free status. Dr. Adam Lauring of the University of Michigan Medical School notes that many physicians have never seen a case of polio firsthand, leading to a lack of awareness of its severity: “The effects can be severe with some patients losing use of their arms and legs, and some winding up on ventilators.”
CDC Recommendations and Traveler Awareness
The CDC is urging travelers to high-risk areas to verify their vaccination status and consider boosters. Experts also recommend that individuals with compromised immune systems prioritize vaccination as a precaution. Some regions on the advisory list, such as the United Kingdom, may surprise travelers unfamiliar with the global polio resurgence.
“You might not think before you go to London, ‘Hey, I better get my polio shot,’” says Dr. Laurin. “So stay informed about which areas have circulating virus.”
The increasing global risk of polio underscores the importance of maintaining high vaccination coverage to prevent outbreaks and protect public health.
