| + | **Suitable drugs include oxytetracycline, tylosin, metronidazole. Oxytetracycline if the drug of first choice for idiopathic ARD but its use for secondary ARD is controversial. In addition, resistance is fast to develop with oxytetracycline. Tylosin and metronidazole may be more appropriate at targetting bacteria that are likely to be present in secondary ARD. |