Several European countries have been slapped with U.S. travel advisories recently. They're mainly due to security issues, such as the rise in petty crimes in one of the world's safest countries , and the risk of terrorist violence in a European summer hotspot . In addition to those, five popular European countries have also been listed in the Centers for Disease Control and Prevention's (CDC) updated global travel alert for polio .

Europe has been seeing an increased detection of poliovirus since 2022. No human cases have been recorded yet. However, the CDC and other health agencies, including the European Centre for Disease Prevention and Control (ECDC) , are concerned about the virus' environmental circulation.

These early poliovirus detections are an early alarm for possible

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