The Biology and Pathogenicity of a Recent Field Isolate of Eimeria praecox Johnson, 1930

摘要: A recent isolate of Eimeria praecox, strain G, was obtained from Georgia and purified. Studies the life history, pathogenicity, cross-immunity were conducted to verify its identity. In inoculated three-week-old chickens, occurrence merogony gametogony limited superficial epithelium upper intestine. Oocysts, 23 x 19.5 microns, with a shape index 1.17 first observed 83 h after inoculation. Mortality morbidity not in any experimental birds. However, there positive correlation between dose oocysts, reduced weight gain, incidence exudative diathesis. These studies showed that E. praecox depresses gains chickens may be economic importance. Although complete immunity avian coccidiosis is believed species specific, immune (G) or acervulina had degree heterologous challenge. Electrophoretic analysis glucose phosphate isomerase lactate dehydrogenase prepared European no differences, confirming identity as praecox.