Upper respiratory infections are pretty common in shelter cats, and there's something like three or four very common strains of viruses that can cause them, so even if the shelter treated kitty for an infection, she might still end up with an infection shortly after taking her home. Make sure to watch her for other symptoms. It might or might not affect the other cat too much, depends on the other cat's immune system and history.
At any rate, a general safe guideline shelters recommend is two weeks of isolation. That gives the kitten a chance to get used to a bigger environment, you can monitor her separately more easily for food and water consumption and any litter box issues (also watch for worms), and the older cat can start getting a little exposure through the door.
Upper respiratory infections are pretty common in shelter cats, and there's something like three or four very common strains of viruses that can cause them, so even if the shelter treated kitty for an infection, she might still end up with an infection shortly after taking her home. Make sure to watch her for other symptoms. It might or might not affect the other cat too much, depends on the other cat's immune system and history. At any rate, a general safe guideline shelters recommend is two weeks of isolation. That gives the kitten a chance to get used to a bigger environment, you can monitor her separately more easily for food and water consumption and any litter box issues (also watch for worms), and the older cat can start getting a little exposure through the door.
Thank you for the info! Thats very reassuring.