The relation between smallpox vaccination and poliomyelitis.
D035843:Biomedical Research; D011051:Poliomyelitis / Q000453:epidemiology*; D012899:Smallpox / Q000517:prevention & control*; D014611:Vaccination / Q000150:complications*; D014612:Vaccines / Q000150:complications*; D012901:Variola virus
D014612:Vaccines
POLIOMYELITIS/epidemiology; SMALLPOX/prevention and control; VACCINES AND VACCINATION/complications