Bactriological studies on some diseases causing broilers mortality with the possibility of vaccine production

ABSTRACT

Two hundred and seventy samples were randomly collected from Sharkia Government and Peasantry Farms in various localities. These samples were subjected from bacteriological investigation allover the year to explore the actual bacterial causative agents. The obtained data revealed that, 65 isolates were E. coll, 20 isolates were Salmonella spp, 15 isolates were Staph aureus and 15 isolates were Campylobacter jejuni with incidence percentages of 24%, 7.4%, 5.5%, and 5.5% respectively. From the results of this study it can be concluded that the E. coli infection is incorporated in complicated respiratory infection and almost need for use of sensitive antibiotic for control measures considered and an important direction to avoid loss of body weight, prolonged respiratory signs and economic losses. Vaccination against E. coli infection induced protection immune response especially vaccinated at 6 days of age. Sensitivity tests related that E. coli were sensitive for lincospectin, doxycydine, gentamicin, colistin sulphat, chloramphicol and amoxicillin while it resistance to erthromycic. Concerning salmonella were sensitive to chloramphenicol, lincospectin, doxycyclin and less sensitive to erythromycin and colistin sulphate. In case of Staph. aureus were sensitive to amoxicillin, gentamycin and lincospectin and less sensitive to erythromycin and resistance to colistin sulphate. In case of Campylobacter jejuni were sensitive to lincospectin, doxycycline, amoxicillin and gentamycin, while no effect could be observed with erythromycin