I don't think there is much to add to what Aesop has said. The references are quite good, and are what I use. I might add Robert's and Hedges' clinical procedures
http://www.amazon.com/Roberts-Clinical- ... y+medicine
I have never used them, but veterinary antibiotics *should* work just fine, you just have to be extra careful regarding dosing.
I would also add a couple of things that I use as "rules of thumb" :
Drain any abscess, and drain it early. Much more important than antibiotics.
fevers >102.0F are MORE likely to be bacterial. <102.0F is LESS likely to be bacterial, and more likely viral. not 100%, but mostly a reliable indicator.
viral illnesses USUALLY have a more gradual onset , whereas bacterial infections USUALLY have an acute onset (the patient says "I felt fine, doc, then, while I was driving home, I suddenly flet like crap")
Bacterial infections USUALLY have a locus of infection (An abscess site, an area of growing redness surrounding a scratch you got, a cough without a runny nose, a sore throat without a cough) whereas viral infections USUALLY involve multiple systems (Body aches, fatigue, fever, cough, AND runny nose)
viral infections USUALLY respond better to NSAIDS like tylenol and ibuprofen than bacterial infections.
This information, is also useful in evaluating whether to go to the doctor or not. It really frustrates patients (and I know this) when they feel like crap, they go to their doctor, and then the doctor says "It's just a virus, no antibiotics will help." After all, they just dragged themselves out of bed to be seen, spent an hour in the waiting room, and they come to find out they would have been better off staying home and eating chicken soup.