So somehow Sam came down with a URI. We isolated him and 5 days later he is fine. Unfortunately, now 4 of our other babies are sick. Apparently we didn't isolate Sam soon enough. The sick ones are all 8+ years and never been sick in their lives. They are so miserable and it's breaking my heart. Since Sam got over it in 5 days, will the others get better in about 5 days as well? Or does it depend on each individual cat?