I lived on a farm and impetigo came in with a batch of new chicks we had ordered (or so it seemed). Several handlers, including me, got it. We treated the sores with ammoniated mercury 5% and they healed fairly quickly.

We were told that it is commonly in the environment and most exposures do not result in skin rashes unless there is a scratch or open sore or wound somewhere. So, it may or may not be from a specific animal. Nonetheless, I'd isolate the suspected animal for a couple of weeks and see if any lesions or hair loss (what it often does to animals who get it as the first symptom) occurs so you can avoid spreading it if the animal is the source.

We were told not to cover or bandage the sores as the air helps it dry and heal and definitely do not scratch as it will start new sores and spread it. Wash hands and scrub under nails after applying ointment with good hot soapy water and dry thoroughly to decrease problems.

Hope this helps.

Callie