As this is the internet, medical questions are answered anecdotally by randoms, like me: I got COVID back in March. I'd say I got medium sick. Worst few days o

As this is the internet, medical questions are answered anecdotally by randoms, like me: I got COVID back in March. I'd say I got medium sick. Worst few days of my life. In the last 9 months I have been in close contact with people who have later also gotten ill, but I have not had any effects myself. So either I'm spreading it or I am immune (or both?). So there you go.