The preparation of antigens from yolk sacs infected with rickettsiae.
TOPPING
N H
NH
SHEPARD
C C
CC
D000941:Antigens; D006801:Humans; D007109:Immunity; D012281:Rickettsia; D014438:Typhus, Epidemic Louse-Borne; D015017:Yolk Sac
D000941:Antigens
TYPHUS/immunity