Does the effectiveness of influenzal and rickettsial vaccines justify their use?
B B
BB
POOL
D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human; D009657:North Carolina; D012281:Rickettsia; D012290:Rickettsial Vaccines; D014612:Vaccines
D007252:Influenza Vaccines; D012290:Rickettsial Vaccines; D014612:Vaccines