If you plan to regularly foster kittens, or if Vidia's URI symptoms linger, look into getting a lysine supplement to keep on hand. It really does help them fight the herpes virus, as it makes it difficult for the virus to survive. Vets usually sell Viralyse, which is a gel in a tube like nutrical, or there are even lysine treats for cats which need it longer term. I start any kitten who looks suspicious for URI on it as soon as they start showing symptoms, and my oldest cat was on it for a long while as she had a recurring/lingering URI as a kitten (it went away after a month or so, and she's been fine since). It doesn't mean they won't need antibiotics/eye meds, but every little thing helps. It's a good sign that she has a hearty appetite, hope she continues to do well for you!