A. A booster dose of IPV.

Good answer! Polio vaccination is indicated in this situation because the student will be working in a medical environment and in contact with small children for a relatively long period of time. An IPV booster is the only choice in the U.S, because OPV is no longer used in this country. This will protect the student against the unlikely possibility of exposure to wild type poliovirus and to circulating vaccine-derived strains that occur in outbreaks in Nigeria. If the student arrived in Nigeria without being immunized and had previously received OPV immunization, then OPV would be safe to administer on site, if it were all that was available. Move on to the last screen.