SOME REFLECTIONS on the Salk vaccine.
D000368:Aged; D006801:Humans; D011051:Poliomyelitis / Q000635:transmission*; D011054:Poliovirus Vaccine, Inactivated; D014611:Vaccination; D014612:Vaccines
D011054:Poliovirus Vaccine, Inactivated; D014612:Vaccines
POLIOMYELITIS/transmission; VACCINES AND VACCINATION