جستجوی مقالات مرتبط با کلیدواژه « Fowl cholera » در نشریات گروه « دامپزشکی »

Avian pasteurellosis, a highly contagious and severe bacterial disease of wild and domestic birds, causing mortality and important devastating economic losses. This cross sectional study was performed to isolate and identify pasteurella multocida in backyard poultry. For the purpose of the study, a total of 350 pharyngeal swab specimens collected from backyard birds suspected of illness during two years in Golestan Province, Iran. Samples were packaged in modified stuart's transport medium, and transferred to the Razi vaccine and Serum Research Institute for bacteriological examination. Out of 350 samples, two isolates were identified as p. multocida on the basis of bacterial cultures, morphological and biochemical characteristics. The isolates were subjected to polymerase chain reaction (PCR) for the detection of KMT1 species specific gene fragment. According to the results of PCR assay none isolates have been confirmed as p. multocida. Since Backyard birds may serve as source of public health and economically important bacteria, implementation of a pasteurellosis surveillance program and biosecurity measures will be helpful to develop disease control measures in the future.

Because P.multocida serotypes have no cross protection Several studies have been focused on identification of immunogenic molecules shared between different serotypes in the hope of production of a wide-range vaccine effective against all causative serotypes. In the present study, crude sonicated cell extracts of P. multocida serotypes A:1, A:3, and A:4 were immunoblotted against chicken hyper-immune sera in order to identify cross-reactive immunogenic proteins of them. 35 chickens aged two months randomly divided into 7 groups of five and were injected by monovalent or trivalent serotypes with time intervals of 14 days between first and second injections, and 10 days between second and third and third to fourth injections. The first inoculum was adjuvanted with complete Freund adjuvant (CFA), the second and third inocula were adjuvanted with incomplete Freund adjuvant (IFA), and the fourth one was without any adjuvant. Results showed that there are at least 5 cross-reactive immunogenic proteins in serotypes A:1, A:3, and A:4, in a way that antibodies produced by chicken in an immune response to immunization with whole cell Pasteurella suspensions are able to react with each of the 3 serotypes. These cross-reactive agents are proteins (or at least in some parts) with the molecular weight of 39, 40, 37, 53, and 30 K.Da. The 39 K.Da band was the most prominent immunoblott and introduced as candidate for molecular identification and future vaccine studies.

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.