First, it is important to state that every animal adopted from a shelter should be taken for an examination by your regular vet within at most 3 days of adoption. With rest and good care, many cats will recover from mild URI in one or two weeks. Sometimes cats need additional help, however. If your cat has any of the following signs, contact your veterinarian.
Not eating for more than 24 hours.
Green or yellow discharge from the nose or eyes (a vet may prescribe antibiotics for this).
Difficulty breathing, especially panting or breathing through an open mouth.
Depressed or unresponsive cat: a slight decrease in activity is expected, but seek vet care if the cat is much less active than usual or than you would expect.
Vomiting or diarrhea that lasts more than 24 hours
Little or no improvement after a week of home care.
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