coccidiosis in chicken, eimeria tenella case model

poultry chicken layer broiler coccidia coccidiosis designs oocysta eimeria tenella brunetti maxima necatrix intestine gut intestinal health location lesions pathology villi signs symptoms treatment control vaccination disinfectant mucosa oocysts transmission tract duck turkey quails diagnosis schizonts acervulina praecox droppings feces coccidial anticoccidial drugs vaccines life cycle diseases medicine illustraton models model case issues