i dont know for sure, but there should be no problem.
the thing is that the rat colonies that rat breeders have are typically free of any disease. They start their breeding colonies with perfectly healthy premium rats, and keep it that way by isolating the breeding project. If a breeding colony gets infected with anything, the radical methods of dealing with it are preferred because disease could cripple the output of the colony indefinitely. So they either sort out and cull all sick animals and all animals that might be sick, or they even cull the whole colony, disinfect the room, and start over with new rats.
so you should be fine. If the rat had anything, it probarbly contracted it in the pet store.
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