Beaver trap- I know this is not a disease but I just thought some of you might want to know. Nomatter how unaggressive they seem at first you will want to tie them down because when you release the trap it will realse the pressure as well as all of the pain. You will want to hold them tight and step on the release and gentally pull their foot out. After you should probably give them pain killers and let them rest. If its broken you should probably research how to set the bone back in place.
Roundworms- This is also personal because I lost some cats to this roundworms as well. The main symptoms are blouting, diarhea, and eventually they will get skinny and stop eating. In very suver cases they will vomit up long white worms. There are some dewormer medicines at walmart that I recommened but if you can't get that then pumpkin seeds work great too.
Upper Respritory Infections- This is personal to me because a couple of my cats died before I could help them because all it said on the internet was to use nasal spray. I find that the main symptoms are, like our common cold, runny nose, always tired, and eventually starts to lose weight. Nasal spray for humans or cats does work a little but if it continues then you should use NyQuil nighttime synous and congestion.