Letter: Administration of oral polio vaccine in relation to time of breast feeding.
D001942:Breast Feeding; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D011051:Poliomyelitis / Q000276:immunology; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage*; D013997:Time Factors
D011055:Poliovirus Vaccine, Oral