Observations on the character of an epidemic of influenza and on the effects of vaccination.
D058872:Epidemics; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000276:immunology*; D014611:Vaccination; D014612:Vaccines
D007252:Influenza Vaccines; D014612:Vaccines
INFLUENZA/immunology; VACCINES AND VACCINATION