Immunization against coccidiosis in fowls

Immunity plays a major role in the control of coccidiosis. With the presently practised system of "protected exposure" under chemoprophylactic medication, problems are encountered because of seasonal variation in litter moisture and coccidial challenge. The alternative, "controlled exposure" or "vaccination" products a more solid immunity and more reliable results. This was found to be the method of choice in coccidiosis control in replacement pullets in the semi-arid subtropical climate of Rhodesia.