CDC warns of polio risk in over 30 countries as spring break travel ramps up

The U.S. Centers for Disease Control and Prevention (CDC) has issued a warning of a "circulating poliovirus" in over 30 countries.

The "Level 2: Practice Enhanced Precautions" alert was published earlier this week.

"Before any international travel, make sure you are up-to-date on your polio vaccines," the agency said.

AMERICAN STUCK IN MIDDLE EAST ESCAPES IN RACE TO REACH CRITICALLY ILL HUSBAND IN CALIFORNIA 

The announcement comes as Americans begin their spring break travels ...