| Abstract: |
- Three hundred both freshly dead and sliaughtered one-day--old up to 4 weeks ducklings were examined for their clinical signs and P .M. lesions.’11- Bacteriological isolation from the heart bl.ood r.evealed that 37 i.solates were suspected to be E. coli ”by thei r culture characteristics, s t ai.nd.ng reaction, and biochemical testings”.The serological identificantion proved that 25 !d • .£.21:.! strains were belonging to 14 different O-groups ”6 -were 0157, 3 were 086, 3 were 022, 2 were 017, 2 were 0137, and one sero-group of each of the following: 08, 015, 021, 042~ 080,092, 0101, 0116, and 0117. The remaining ”12” strains were antyp- ah1eo111- The pathogenicity of the isolated ]. cO,li strains wastested in 3-days old Peking ducklings by intraperitoneal route of inoculation. All the isolated serogroups were pathog- enic, with special reference to O-groups 157, 86, and 17 which were highly virulent.The clinical signs and P.M. lesions of inoculated birds were similar to that of natural ou~breaks.1V- Trials to determined sensitivity of the isolated E. coli strains to chemotherapeutics, reve1ed that all the isolated strains were hj.,g,hly sensitive to Chloramphenicol, Nitrofurantion, and Sulpnamethoxazole.
|
|
|