[On the problem of experimental evaluation of vaccines against typhoid and paratyphoid].
D006801:Humans; D010284:Paratyphoid Fever / Q000276:immunology*; D014435:Typhoid Fever / Q000276:immunology*; D014436:Typhoid-Paratyphoid Vaccines; D014612:Vaccines
D014436:Typhoid-Paratyphoid Vaccines; D014612:Vaccines
PARATYPHOID FEVERS/immunology; TYPHOID/immunology; VACCINES