Two good reasons to drop type 2 virus from oral polio vaccine.
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D006801:Humans; D032521:Immunity, Herd; D011051:Poliomyelitis / Q000276:immunology* / Q000517:prevention & control; D017955:Poliovirus / Q000145:classification*; D011055:Poliovirus Vaccine, Oral / Q000009:adverse effects* / Q000276:immunology
D011055:Poliovirus Vaccine, Oral