experimintal study of peracute fowl cholera due to pasteurella multocida vaccinal strain (serotype a1) in chickens
نویسندگان
چکیده
in order to show the type and severity of gross and histopathologic lesions induce by vaccinal strain (serotype a1) of pateurella mulocida, ten four-week-old spf chickens were inoculated intramuscularly with 75 cfu of ( 0.5 ml of 10-7 dilution) bacterium. all birds died in less than 16 hours. no prominent gross lesions were observed in different organs. in microscopic examination, the most common histopathological findings were as congestion and hemorrhage. moreover, large amount of viscid mucus were observed in digestive tracts.
منابع مشابه
Experimintal Study of Peracute Fowl Cholera due to Pasteurella multocida Vaccinal Strain (serotype A1) in Chickens
In order to show the type and severity of gross and histopathologic lesions induce by vaccinal strain (serotype A1) of Pateurella mulocida, ten four-week-old SPF chickens were inoculated intramuscularly with 75 cfu of ( 0.5 ml of 10-7 dilution) bacterium. All birds died in less than 16 hours. No prominent gross lesions were observed in different organs. In microscopic examination, the most comm...
متن کاملVirulence of Avian Serotype A1 Pasteurella multocida for Chickens and Mice.
The virulence of Pasteurella multocida (P. multocida) serotype A1 for chickens and mice was determined. Groups of chicken and mice were exposed intramuscularly and intraperitoneally to various concentration of P. multocida broth culture, respectively. This strain was highly virulent for chickens so that those exposed to only 7 c.f.u. of the organism died in less than 24 hours. Groups of mice ex...
متن کاملvirulence of avian serotype a1 pasteurella multocida for chickens and mice.
the virulence of pasteurella multocida (p. multocida) serotype a1 for chickens and mice was determined. groups of chicken and mice were exposed intramuscularly and intraperitoneally to various concentration of p. multocida broth culture, respectively. this strain was highly virulent for chickens so that those exposed to only 7 c.f.u. of the organism died in less than 24 hours. groups of mice ex...
متن کاملPathology of Pasteurella Multocida Infection in Chickens
The present study was conducted on 42, 12-15 weeks old birds to study the gross and histopathological changes induced by Pasteurella multocida infection. The birds were divided into two groups viz., control and infected consisting of 21 birds each. The birds in infected group were administered with LD 50 of local isolate of Pasteurella multocida A:1. Three birds from each group were randomly sa...
متن کاملRole of capsule in the pathogenesis of fowl cholera caused by Pasteurella multocida serogroup A.
We have constructed a defined acapsular mutant in Pasteurella multocida X-73 (serogroup A:1) by disrupting the hexA gene through the insertion of a tetracycline resistance cassette. The genotype of the hexA::tet(M) strain was confirmed by PCR and Southern hybridization, and the acapsular phenotype of this strain was confirmed by electron microscopy. The hexA::tet(M) strain was attenuated in bot...
متن کاملSimplified identification of somatic varieties of Pasteurella multocida causing fowl cholera.
Representative type strains as well as field strains of Pasteurella multocida from fowl cholera were examined by the indirect hemagglutination procedure and by a rapid plate agglutination test. The former method identified the specific capsular or K substance, and the latter identified the somatic antigens. Inagglutinable organisms were made agglutinable for the rapid procedure by treatment wit...
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عنوان ژورنال:
archives of razi instituteناشر: razi vaccine & serum research institute (rvsri)
ISSN 0365-3439
دوره 64
شماره 1 2016
کلمات کلیدی
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