Over the years, I have taken in quite a number of 'unadoptable' cats -- cats with minor to major medical problems. I have won more battles than I have lost. In the last couple of years, I have focused on homeless Persians, as Persians seem to have more problems in public shelters than most cats.
I presently have 4 purebred Persians, all from public shelters.
Olivia (black) came to me totally matted -- we called it a turtle shell -- and was pregnant when spayed. The owners had kept her outside. She has severe socialization issues and is affectionate known as The Ninja Princess
Spencer (b&w van) came to me via a shelter from an elderly couple who were suffering from alzhiemers. He is supposedly 2 years old, but they had him 3 years. He also was totally matted and very thin. The first few weeks were interesting as he did not like to be petted. After almost a year, he's fluffy and an affection hog. We are still working on his litterbox issue.
Isabel (silver chinchilla) came from a notorious public shelter and was 1 day away from euthanization. The owners dumped her and another cat at the shelter because of allergies. When I picked her up, she was shaking and clunge to my neck like an infant. Again, she was matted totally. She also was very thin, had a sinus infection (which is still ongoing), and pneumonia. My vet did not think she would make it, but she did. She's gained 4 pounds and now allows me to groom her with only a token growl. She, however, is still terrified of strangers and loud noises, but this is improving.
Maggie (blue) came from another notorious public shelter and was given 3 days to be adopted or die. She came with her sister Maya (RIP). The pair were part of a backyard breeding program. When they no longer could have kittens, they were starved, shaved literally down into the bone, and dumped in a backyard. Both weighed 3lbs, both had an infected uterus, and both had severe URI. By law, they were spayed despite their condition before I could take them home. Maya died 2 weeks later because her uterus had ruptured before she was spayed. Maggie hung on but ended up with herpes in her eyes. One eye ruptured and was removed. The other eye also ruptured, but thanks to Dr. Sara and 2 eye grafts, she now has 30% vision. Despite being starved, she will not eat on her own, so 4 times a day, I or my husband hand-feed her. She weighs 5.25lbs. She is tiny and I don't understand how she could have had kittens. But even more amazing is she is so very loving and sleeps every night plastered next me.