title: Evolution of poliovirus since introduction of attenuated vaccine.
mesh_terms: D006801:Humans; D011051:Poliomyelitis / Q000209:etiology*; D011054:Poliovirus Vaccine, Inactivated / Q000009:adverse effects*; D014613:Vaccines, Attenuated / Q000009:adverse effects*
chemical_list: D011054:Poliovirus Vaccine, Inactivated; D014613:Vaccines, Attenuated