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Infection is usually sporadic, but once immunity has developed it is likely not to recur. During the neonatal period, passive immunity is sufficient, only after this wanes are clinical signs of the disease apparent.

Infection is usually sporadic, but once immunity has developed it is likely not to recur. During the neonatal period, passive immunity is sufficient, only after this wanes are clinical signs of the disease apparent.

There are many species of coccidia that affect cattle, but ''[[Eimeria spp.|Eimeria]] zuernii, E. bovis'' and ''E. alabamensis'' are by far the most common. ''E. zuernii'' is the most pathogenic of these species.

There are many species of [[:Category:Coccidia|coccidia]] that affect cattle, but ''[[Eimeria spp.|Eimeria]] zuernii, E. bovis'' and ''E. alabamensis'' are by far the most common. ''E. zuernii'' is the most pathogenic of these species.