Changes in CDC Polio Vaccine Recommendations
Many polio outbreaks occurred in previously polio-free countries during 2003–2011. For this reason, CDC has been recommending a one-time booster dose with inactivated poliovirus vaccine (IPV) for certain travelers. Previously, this recommendation has been not only for adults traveling to countries with active poliovirus circulation, but also for adults traveling to countries that bordered countries with active circulation.
Currently, endemic poliovirus circulation has never been interrupted in only 3 countries: Afghanistan, Nigeria, and Pakistan. Still, the affected areas within each of these countries have become smaller. Because of the substantial progress of the polio eradication initiative in 2012–2013, and in order to harmonize CDC recommendations with World Health Organization (WHO) recommendations, CDC now recommends an adult IPV booster dose only for travelers to countries with active poliovirus circulation. Countries are considered to have active poliovirus circulation if they have ongoing endemic circulation, active polio outbreaks, or environmental evidence of active wild poliovirus circulation.
In addition, CDC recommends an adult IPV booster dose for certain travelers to some countries that border areas with active poliovirus circulation. These recommendations are based on evidence of historical cross-border transmission. The recommendations apply only to travelers with a high risk of exposure to someone with imported wild poliovirus (WPV) infection. These travelers would include those working in health care settings, refugee camps, or other humanitarian aid settings.
Comment: In effect, the CDC has stopped recommending IPV (Injectable Polio Vaccine) to all visitors to India, but is now suggesting that only certain ‘high risk’ population (working in health care settings, refugee camps, or other humanitarian aid settings) take the vaccine, if there are completely immunized previously.