CDC adds Afghanistan alert

The United States Centers for Disease Control and Prevention now flags Afghanistan on its Level 2 global polio travel notice, which is the agency’s list for places with circulating poliovirus where travelers are told to check vaccination before they go. The notice dated March 9, 2026 says the country list is based on poliovirus found in people or in sewage samples within the past 13 months. (cdc.gov) Polio is a virus that can spread quietly in stool-contaminated water or through close contact, which is why health agencies watch sewage the way meteorologists watch radar. The Centers for Disease Control and Prevention says some destinations are added even when no traveler would see a visible outbreak, because environmental samples can show the virus is still moving. (cdc.gov) Afghanistan is not just another country on that list. The Centers for Disease Control and Prevention’s Yellow Book says wild poliovirus type 1 is still endemic in only two countries in the world: Afghanistan and Pakistan. (cdc.gov) The World Health Organization said on March 4, 2026 that since October 1, 2025, Afghanistan had reported 5 new wild poliovirus type 1 cases, and Pakistan had reported 4. The same statement said Afghanistan had 9 wild polio cases in 2025 to date, compared with 31 in Pakistan. (who.int) Inside Afghanistan, the virus has been concentrated in the south and east. A World Health Organization Afghanistan snapshot for June 2025 said the south and east remained endemic areas, with 1 wild polio case and 35 positive environmental samples reported in 2025 up to that point. (emro.who.int) The hard part is not inventing the vaccine. The hard part is reaching every child often enough that the virus runs out of places to hide, and the World Health Organization said limits on campaign methods in Afghanistan had left vaccination coverage too low in some areas. (emro.who.int) For travelers, the advice is simple but stricter than many people expect. The Centers for Disease Control and Prevention says all travelers should be up to date on polio vaccination before any international trip, and adults going to places with circulating poliovirus may need a one-time lifetime booster. (cdc.gov) People staying longer than 4 weeks can face another layer of paperwork. The Centers for Disease Control and Prevention says some countries with poliovirus circulation may require proof of a polio vaccine dose given between 4 weeks and 12 months before departure, and that record is documented on the International Certificate of Vaccination or Prophylaxis. (cdc.gov) Afghanistan appears on the same March 2026 global notice as countries including Nigeria, Somalia, Yemen, Sudan, Pakistan, the United Kingdom, Germany, and Poland, because the list tracks recent virus detection rather than a single kind of outbreak. That is why a country can land on the notice either for wild poliovirus or for vaccine-derived poliovirus found in people or sewage. (cdc.gov, cdc.gov, cdc.gov) So this update is less about a new border rule than a reminder that polio eradication is unfinished in exactly two places, and Afghanistan is one of them. For anyone flying there in 2026, the most important travel document may be the vaccination record they update before leaving home. (cdc.gov, cdc.gov)