Anyone can be sued for almost anything but according to legal experts, for a lawsuit to be successful a lot of things have to be proven by the plaintiff. If someone wants to sue for getting infected with the coronavirus, they have to show negligence, which can be a difficult task. Unless the person infected knows exactly who did it, and the moment they were infected, suing a person can be difficult. So, unless you are acting recklessly and announcing you have COVID-19 and coughing on people, the chances of someone bringing a lawsuit against you are slim to none.
To learn more about this issue and hear the opinion of a legal professional visit : https://www.nolo.com/legal-encyclopedia/coronavirus-can-i-be-liable-for-getting-someone-else-sick.html