title: An infection in chickens with a strain of Mycoplasma gallisepticum of low virulence.
abstract: A slow-spreading infection due to a strain of Mycoplasma gallisepticum was detected serologically in a flock which remained free of clinical symptoms. The strain was shown to be tylosin resistant. Serological studies indicated that vertical transmission occurred.
mesh_terms: D000400:Air Sacs / Q000382:microbiology; D000818:Animals; D002645:Chickens; D005260:Female; D008297:Male; D008826:Microbial Sensitivity Tests; D009174:Mycoplasma / Q000187:drug effects / Q000276:immunology / Q000302:isolation & purification / Q000378:metabolism / Q000472:pathogenicity*; D009175:Mycoplasma Infections / Q000209:etiology / Q000276:immunology / Q000382:microbiology / Q000662:veterinary*; D011201:Poultry Diseases / Q000209:etiology* / Q000276:immunology / Q000382:microbiology; D014774:Virulence