Changes

* They are particular useful for avain coccidiosis because:

* They are particular useful for avain coccidiosis because:

** They supress clinical and subclinical coccidia

** They supress clinical and subclinical coccidia

** As the entire coccidia population isn't destroyed it always natural immunity to develop

** As the entire coccidia population is not destroyed it allows natural immunity to develop

** They reduce oocyst build up in the litter

** They reduce oocyst build up in the litter

** They exert little selection pressure on the coccidia and so resistance develops slowly

** They exert little selection pressure on the coccidia and so resistance develops slowly

* Some of these drugs are '''highly toxic to horses, turkeys and gamebirds'''.

* Some of these drugs are '''highly toxic to horses, turkeys and gamebirds'''.

===Other Agents===

===Other Agents===