I don't know about the practices of others, but mine are very careful. Quarantines are kept on a different floor. I don't use gloves, (except for feeding) but thorough hand washing before and after handling is a must. I am even careful to not allow a quarantine to touch my clothing. Granted my quarantines are usually rescued animals, who have a higher risk of poor health, but I say better safe than sorry.
I don't handle new arrivals much, for the first month, and keep them separate for three. I also have separate tongs, and thaw food separately.
Maybe a bit extreme, but I don't have a ton of animals, so its not hard for me to devote a little extra time and effort.
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James.....
"Curiosity killed the cat, but satisfaction brought the beast back."