can anyone tell me what causes cat flu and if an infected cat ever get rid of it fully? ive been trying to look it up, and from what ive read its caused by either the herpes virus or the calicivirus, is that correct? does a cat that has had either of these ever fully get rid of it? or could cat flu in some cases just be abit like a human cold that just goes away? and if a cat did have either, could they infect other cats even if they are vaccinated?