If you don’t want to catch something, you shouldn’t go near sick people.
The fortuneteller told me that my previous life was as a sick person.
"How’s it going?" "Couldn’t be better." "Good. I’m surprised to hear that from a sick person though."
A person who is sick is a sick person. They are also a patient, at least we can hope they are, for their sake.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Note that this uses the にん reading for 人. This is because every sick person enjoys laying in bed playing nintendo.