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No, cats cannot catch a human cold. They can get other contagious upper respiratory diseases from other cats though. Does Fluff go outside?
OK. We can see sneezing for a number of reasons. As long as none of the other 3 cats are newly introduced, that will generally rule out infectious disease.
I would consider the possibility of a tooth root abscess, feline herpes virus rhinitis, or allergy as the underlying cause.
Did the vets get a good look in her mouth? Are you seeing any discharge from her nose?
OK, is she still eating well and acting normally otherwise?
OK. There are a couple of things you can try at home for this as long as she remains normal otherwise. If she becomes lethargic, has decreased appetite or colored discharge from her nose she should be examined again. In the meantime, you can give her a supplement called L-lysine daily. For an adult cat, give 500mg twice daily. This can be mixed with her food. This will help if the sneezing is due to FHV infection (feline herpes is similar to human herpes in that it infection never really goes away, it becomes dormant and can flare up).
The other thing you can try is an over the counter human antihistamine. You can give 1 tablet of Chlortrimeton (chlorpheniramine 4mg) every 12-24 hours to help control sneezing due to allergies. Just make sure you do not give a product that has a decongestant - these are toxic to cats.
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