I have just tried ACV for Upper Respiratory Infection for the first time and I must say I was skeptical but now I am amazed. I have 20 cats and when the first one started sneezing I had no idea how I was going to keep this under control. I use lysine and it def helps but they dont like it the treats more than the gel. Also a little pricey. The ACV is a miracle. I did the back of the neck thing and also on the paws and after 24 hrs the improvement is unbelievable. They actually seemed to even like it. It was SO much easier than trying to shove meds at them they don't want to eat. I cant even believe how much better they are today. I will continue giving them until gone and beyond. The URI is very hard on them and can last for weeks if not treated so I was freaking out wondering how I was gonna keep this under control. Thanks to this site I know now and I want to tell every cat owner on the planet about it especially the ones desperate to help their kitties but dont have money for very expensive vet care.I always prefer the natural option if possible and this is awesome information. Thanks a million times really.