[Studies on the effectiveness of live antityphoid vaccine in Bulgaria].
D001203:Ascomycota; D002031:Bulgaria; D006801:Humans; D014436:Typhoid-Paratyphoid Vaccines; D014613:Vaccines, Attenuated
D014436:Typhoid-Paratyphoid Vaccines; D014613:Vaccines, Attenuated
TYPHOID-PARATYPHOID VACCINES