I don't know, but there are many things I would treat the whole flock for. For example, if one sniffles and sneezes, they all get VetRX in their water. Or if one displays any symptoms of coccidiosis, they all get Corid in their water. So, it would depend on if there are an adverse effects to the medication you are using. Maybe ask in the emergencies thread?Is it so ~ if one chicken has a mycoplasma symptom than all the flock is exposed but don't all display symptoms as some are more immune than others...& should all birds be treated whether showing symptoms or not anyway?