Jen you know you did all you could. It's cause you have a kind soft heart that you feel this way. A friend just adopted a foster who was going to be put down because of an eye infection. The eye needless to say is treatable but she also had cat flu and passed it on to her other cat. Timmy could have picked something up from just about anywhere. After many vet visits, hospital stays and tests for both they are on the mend and doing well. She does not regret in the least getting her new kitty . Apparently this cat flu spreads like human flu and you don't even realize that just petting a sick cat and then another can spread it.