title: On increasing the yield and potency of typhus vaccine prepared from infected yolk sacs.
authors.forename: V
authors.initials: V
authors.lastname: GROUPE
authors.forename: C
authors.initials: C
authors.lastname: NIGG
authors.forename: J O
authors.initials: JO
authors.lastname: MACFARLANE
mesh_terms: D006801:Humans; D012290:Rickettsial Vaccines; D014438:Typhus, Epidemic Louse-Borne; D015017:Yolk Sac
chemical_list: D012290:Rickettsial Vaccines; C028280:typhus vaccine