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Báo cáo khoa học: "Competitive exclusion against Salmonella gallinarum of Salmonella enteritidis infected chickens"

Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Competitive exclusion against Salmonella gallinarum of Salmonella enteritidis infected chickens | J. Vet. Sci. 2001 2 1 33-36 JOURNAL OF Veterinary Science Competitive exclusion against Salmonella gallinarum of Salmonella enteritidis infected chickens Young-Ju Lee Min-Su Kang Yong-ku Woo In-Pil Mo and Ryun-Bin Tak1 Avain Disease Division National Veterinary Research and Quarantine Service Anyang 436-016 Korea Department of Public Health College of Veterinary Medicine Kyungpook National University Taegu 702-701 Korea To evaluate the degree of competitive exclusion against Salmonella gallinarum S. gallinarum of Salmonella enter-itidis S. enteritidis infected chickens fifty-six 4-week old Hyline layer suspected of S. enteritidis infection were chal-leneged with S. gallinarum. All chickens were tested for S. enteritidis isolation using cloacal swabs and serum plate agglutination test using S. enteritidis Ag. before challenge and classified into four groups SE isolated SE nonisolated SE seropositive and SE seronegative . None of the SE isolated and the SE seropositive groups died after challenge and the average weight gains were 245.5g and 254.6g respectively. But in the SE nonisolated and the SE seronegative groups mortality was 18.2 and 20.6 and the average weight gains were 150.1g and 111.2g. The incidence of reisolation of S. gallinarum of the SE isolated and the SE seropositive groups were 41.7 and 47.6 from liver 33.3 and 47.6 from spleen and 8.3 and 14.3 from cecum respectively and the SE nonisolated and the SE seronegative group were 63.6 and 64.7 from liver 84.1 and 88.2 from spleen and 47.7 and 52.9 from cecum. The serological response of the SE isolated and the SE seropositive groups hardly changed from 75.0 and 81.8 before challenge to 75.0 and 85.7 after. But the other two groups were found to be sigificantly higher after challenge and increased from 0 and 18.2 to 100 . Consequently S. enteritidis preinfected chickens were found to be significant different in terms of mortality weight gain reisolation of S. gallinarum and serological response compared .