I would like to know what to do to doctor up some outdoor cats and keep the the problem away. A few of them every once in awhile experience sneezing and a green glob of crud flies everywhere. The cats seem healthy and all just like they have a cold. My wife gives them ; I think 10 mg omixicillin for a couple days and it seems to go away and then awhile later- it comes back. Is there anyone that knows what this might be and what med to give them that is a bit stronger to totally get rid of this stuff. I can find out exactly what she gives them if it would help. Thanks for any info you all can provide