title: [The stability of increased virulence of vaccine strain E of Rickettsia prowazekii].
mesh_terms: D000818:Animals; D001428:Bacterial Vaccines; D002642:Chick Embryo
chemical_list: D001428:Bacterial Vaccines
vernacular_title: Stabil'nost' povysheniia virulentnosti vaktsinnogo shtamma E rikketsiĭ Provacheka.