title: Difference in the virulence of Ureaplasma urealyticum isolates.
abstract: The virulence of Ureaplasma urealyticum strains was tested by intrarenally infecting white mice of undefined, LATI (Gödöllö, Hungary) and BALB/c breed. Freshly isolated human strains differed in virulence; when subcultured in U-9 medium they showed a gradual loss of virulence. Ureaplasma strains of calf and swine origin were virulent to mice in a medium degree. Some of the inoculated mice showed the signs of latent infection.
mesh_terms: D000818:Animals; D002417:Cattle / Q000382:microbiology; D002645:Chickens / Q000382:microbiology; D003470:Culture Media; D005260:Female; D005831:Genital Diseases, Female / Q000382:microbiology*; D005832:Genital Diseases, Male / Q000382:microbiology*; D006801:Humans; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009180:Mycoplasmatales Infections / Q000382:microbiology*; D013552:Swine / Q000382:microbiology; D014509:Ureaplasma / Q000472:pathogenicity*; D014570:Urologic Diseases / Q000382:microbiology*
chemical_list: D003470:Culture Media