Hidden and dangerous. Polio could soon be wiped out--but only if scientists can track down the last carriers.
Helen
H
Branswell
D002353:Carrier State / Q000821:virology*; D006801:Humans; D016867:Immunocompromised Host; D018445:Infectious Disease Transmission, Vertical / Q000517:prevention & control; D011051:Poliomyelitis / Q000517:prevention & control* / Q000635:transmission* / Q000821:virology; D017201:Virus Shedding