THE WHY AND WHEREFORE OF MASS ORAL POLIO VACINE.
D006801:Humans; D007115:Immunization Schedule; D011051:Poliomyelitis; D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines
D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines
IMMUNIZATION SCHEDULE; POLIOVIRUS VACCINE, ORAL