Cats actually bring a few parasites, a few fleas plus some diseases and a few can turn serious but not many. If cats were creating too much sickness they would not need invaded our lives as well as they have got. But there are still people out there who do nothing like felines. When I first went to China about 20 years ago there have been very few felines living with people and very few wild pet cats. I was impressed because I've acquired cats all my entire life and I never thought people didn't like cats. But then in China the folks said cats carried disease and that was it. I think that may have something to do with that cat sick you get in your attention. Not serious simply a slight problem for weekly And if you were pregnant you had to stay away from cats. I think they were discussing toxoplasmosis, but if you get that whenever you are a kid it should not affect your child. They also said cats were grubby but I don't believe so. I believe pet cats are one of the cleanest household pets you could have. I think that came from the cats killing the rats and mice. Because rats are extremely dirty family pets then because the cats wiped out and ate them they will also be filthy. A soiled by connection kind of thing. Also there were some big sewer rats working round during the day. Once I found a rat and a kitty face off each other and the feline wasn't much bigger than the rat. They were about a feet apart staring the other person out and the cat ran away. I'm not amazed the rat's teeth were bigger that the felines.
Then your nine lives of the humble kitten who only wished to help mankind by eliminating rodents that transported disease took a significant flip for the even worse during the dark ages. Where witch hunts and using up at the stake were the norm. A person who didn't like felines somehow connected those to witches and they were burnt at the stake with there owners. That they made that connection I'll never know. It started off with Pope Gregory IX in the 1232 who deemed the normal house kitty as diabolical. Then to make matters even worse in1484 along emerged the greatest pet cat killer of all time, Pope Innocent VIII, who decreed something along the lines of all cats originated from hell and should came back to the fires of hell by fire. Pet cats were mercilessly prosecuted and were burnt so they might go back to the fires of hell. It really is amazing any survived because if you were caught with a kitty you were burnt mutually. I still go to chapel and sometimes I simply wonder why. And of course the Black Loss of life was in the backdrop surviving and growing because there have been no felines to eliminate the rats that transported the fleas that caused the condition. Then along emerged the cat's savior King Louis XIII of France, who in the 1630s repealed regulations and cats once more started to live. However they were still hated and wiped out for many generations from then on. I have no idea if the African american Death subsided but cats once again guarded mankind contrary to the diseases transported by rodents. As well as the famines due to mice plagues.