I personally dislike letting people know when I am unwell. Am I required to inform them so they can have kavana for the mitzvah of bikur cholim, or can they fulfill it without having the kavana? Also- are there other reasons I would need to inform people?
Clarification: I am taking necessary health precautions (ex: social distancing, washing hands before handling food, etc.)
A person is not obligated to tell other people when they are sick. It can be helpful for other people to know, so that they can daven for you, however you are not obligated to do so. Additionally, you are not obligated to tell them, so that they can visit you. If someone does visit you, if you want, you can mention to them that it happens to be that they are doing bikur cholim. However, as stated, you are not obligate to do so. What we do have to be careful of is not to cause other people to get sick because of us. Therefore, whatever you feel will help to prevent spread that germs that you have, should be implemented. Washing your hands, covering your mouth when you cough or sneeze etc., social distancing when you are sick are good ideas.
Hashem should help you and all of Klal Yisroel to stay healthy.