When I adopted Rosie and Lilly in April they both had the shelter crud and did 21 days of doxy given to me by the shelter. After they were done Rosie seemed to get it again so I took her to my vet. The vet guesses she has Herpes (she came from a hoarder and had kittens before she was 1) We did 2 more rounds of antibiotics and she is much better, no more runny eyes or nose, but still sounds like she has a stuffy nose. My vet had me start both girls on Lysine (Lilly is symptom free, but they eat out of each other's dishes) when we started Rosie on the 2nd round of antibiotics. So my question is: we are currently using Viralys, is there any difference other then price between Viralys, Now, and Tomyln brands? And does anyone have any experience adding Lactoferrin to the treatment? Can both cats use the Lactoferrin since we food share? If you like the lactoferrin what brand do you use.