Quote Originally Posted by Coleslaw007 View Post
Years ago when I adopted a cat from the humane society with a bad viral URI, the vet told me about L-lysine supplements, he said to sprinkle a capsule into his food, about 500mg per day. The cat got better quickly. He was picky while sick though, I had to mix it into tuna to get him to eat it. It's better to do it in 2 divided doses in the morning and evening so it's more evenly in his system.
L-lysine suppresses viral replication, makes the virus unable to reproduce so it dies quickly. You can use capsules meant for humans, it helps with the flu for you too.

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This is a good point; a lot of nasty, super contagious kitty diseases present with URI symptoms, and L-Lysine can help keep some viral issues at bay. If your kitty gets URI type symptoms often, you might want to consider investigating chronic viral disorder vs allergies. Also, sometimes a URI can be treated with simple antibiotics to prevent secondary bacterial infections from getting out of control. Hope your kitty feels better soon!