CDC Updated Polio Travel Advisories for 29 Nations
Travelers to these 29 countries should verify their vaccination status before departure.
Updated on Sept. 24, 2026 in COVID-19
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The CDC has issued level 2 travel advisories for 29 countries where poliovirus has been detected in humans or wastewater over the past 13 months. This update urges international travelers to ensure they are up to date on their polio vaccinations.
Why it matters
The advisories are a precautionary measure against the international spread of poliovirus in regions where the virus remains active in environmental or human samples. While polio was declared eradicated in the U.S. in 1979, these notices help protect travelers and prevent potential reintroduction.
The CDC based these level 2 travel advisories on reports of poliovirus detected in human or environmental samples within the last 13 months. While the inactivated poliovirus vaccine is 99 to 100 percent effective, gaps in population immunity remain a global concern.
The players
CDC
The national public health agency of the United States that sets immunization standards and monitors international disease threats.
The details
The polio vaccine works by stimulating the immune system to produce antibodies that neutralize the virus before it can reach the central nervous system, where it can cause paralysis. In the U.S., the standard of care is a four-dose series for children to ensure durable protection. The CDC advisories focus on countries where active circulation has been documented, such as in wastewater samples found in London in 2026 or Hamburg in October 2025.
Timeline
1979: Polio eradicated in the US
October 2025: Wild poliovirus detected in Hamburg wastewater
2026: Polio detected in London wastewater
September 24, 2026: CDC updated travel advisories
Health Landscape
Globally, polio cases have decreased by 99 percent since 1988, with vaccines preventing an estimated 20 million cases of paralysis. These new travel advisories reinforce the ongoing necessity of vaccination as the primary defense against the re-emergence of the virus in vaccinated populations.
If you are planning international travel, verify your vaccination history with your physician to ensure you have completed the full series. Discussing your itinerary with a healthcare provider is the best way to determine if additional precautions are necessary for your specific destination.
The takeaway
Maintaining high vaccination coverage is the only way to prevent the recurrence of polio in communities. If you are unsure of your vaccination status, consult your doctor to review your records and determine if a booster is indicated before your next trip.
Further reading
For more information on recommended immunizations, visit COVID-19.
Source note: This article includes information reported by Mail Online.
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