Key Aspects:
The CDC has issued a Level 2 Travel Health Notice after poliovirus was detected in 32 countries.
Several destinations on the list include major cruise hubs or ports visited by ships.
Health officials recommend passengers ensure they are up to date on polio vaccinations before international sailings.
A global polio warning from US health officials is drawing new attention to dozens of destinations popular with cruising.
As millions prepare for spring and summer trips, the US Centers for Disease Control and Prevention (CDC) says poliovirus has been detected in 32...
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