Infectivity and persistence of Salmonella Typhimurium for zebra finches (Poephila guttata) isolated from the same species.
Salmonella Typhimurium (S. Typhimurium) originating from a naturally infected zebra finch (Poephila guttata), a common cage bird, was examined for the infectivity to the same species of the birds because of its importance to public health. Eight birds per group for each experiment were used. When zebra finches were inoculated orally with 10(2), 10(4) or 10(5) colony forming units (CFU) of S. Typhimurium and observed for 7 days, all the birds receiving 10(5) CFU of S. Typhimurium were positive for the Salmonella in the liver or the intestines and necrotic foci in the liver were observed in 7 birds. When zebra finches were inoculated with 10(5) CFU of S. Typhimurium and observed for 22 days, the S. Typhimurium was found in fecal samples throughout the experimental period and the maximum S. Typhimurium counts in feces were 4.0 x 10(3) CFU per gram. S. Typhimurium was recovered from the liver, spleen and intestines in 2 birds and necrotic foci in the liver were also observed in 6 birds. The results indicate that S. Typhimurium originating from the zebra finch is pathogenic to these birds and the persistence of the pathogen lasts at least for 22 days.
Nagano Livestock Hygiene Service Center, Japan.
Y
Y
Sato
T
T
Aoyagi
D000818:Animals; D001715:Bird Diseases / Q000175:diagnosis / Q000453:epidemiology*; D001717:Birds / Q000382:microbiology*; D005243:Feces / Q000382:microbiology; D007422:Intestines / Q000382:microbiology; D008099:Liver / Q000382:microbiology; D008297:Male; D012481:Salmonella Infections, Animal / Q000175:diagnosis / Q000453:epidemiology*; D012486:Salmonella typhimurium / Q000302:isolation & purification*; D013154:Spleen / Q000382:microbiology