CONCURRENT EXPERIMENTAL INFECTION OF E. COLI AND NEWCASTLE DISEASE VIRUS IN TURKEYS.

Résumé

One thousand six hundred day old poults were randomly divided into four pens of 400 poults each. Twenty-five percent of the birds in pens 3 and 4 were inoculated orally, with Eschericia coli (E. coli) 0111ab. Ten percent of the poults in pen 2 were inoculated, intratracheally with 10°EIDso of Newcastle disease virus (NDV), A1.315/12 and 10 percent of the poults in pen 3 (previously exposed to E. coli 0111ab) were also inoculated with NDV. A total of 19 E. coli 0111ab recoveries, was made out of 200 birds that were exposed to E. coli in pens 3 and 4. Sampling of the liver was superior to sampling of either the caecal junction or the yolk sac in E coli recoveries. Airsacculitis was first observed in birds dying at 3 weeks of age, but the severity of lesions was maximum at 7 to 10 weeks of age. High mortality and morbidity observed in the commercial farms in epizootics of concurrent infections of E. coli and NDV, were not observed in this study.