Some observations on the caecal microflora of the chickens during experimental acute fowl typhoid

Quantitative and qualitative microbial examination was carried out on caeca l contents non-and postinfection with Salmonella Gallinarum perorally of fi ve-month-old female New Hampshire Salmonella-free chickens. At 1, 4, 7, 14 and 21 days post inoculation (PI) seven infected chickens were sacrificed a nd caecal contents examined bacteriologically. Seven dead infected and seve n control (noninfected) were also analysed. During the first 4 days PI and recovery period (14-21 days) the isolation of aerobic and anaerobic bacteri a from caecal contents didn't distinguish from these of control chickens. P opulation of bacteria within the microflora of the caecum appear to undergo significant changes in clinical period of the disease (4-7 days), when Esc herichia coli, Staphylococcus spp. faecal streptococci and H2S-producing Cl ostridia rose to very large numbers. At the same time the Lactobacilli and Bifidobacteria significantly decreased. The values of the Salmonella Gallin arum strains during infectious process remained high. All these changes in bacterial aerobic and anaerobic flora were direct consequence of Salmonella Gallinarum infection of the chickens.