Birds should build resistance to the strain of Coccidia in their environment.
If a bird has an illness from something else or they are in a weakened state, then they can experience an overload. https://www.merckvetmanual.com/poultry/coccidiosis/overview-of-coccidiosis-in-poultry
If a bird has an illness from something else or they are in a weakened state, then they can experience an overload. https://www.merckvetmanual.com/poultry/coccidiosis/overview-of-coccidiosis-in-poultry
