Hii guys, is there any chance of re-infection in COVID-19

Hii guys, is there any chance of re-infection in COVID-19. I was tested positive in first week of September, CORADS-5. Was admitted in hospital for a week, taste and smell sensation recovered after more than a month, still there is breathless with heavy activity. But yesterday I went with my friends father for a chest CT, I was wearing the mask all the time, no direct contact. His CT came out to be CORADS-4. He has been admitted now, but since morning I got sore throat and mild cold. Is. Reinfection possible? What should I do now?

Most likely post covid fibrosis… Do one CT and if u see fibrosis, take Pirfenidone…

Please tell me guys! If there are cases of re-infection. Then how vaccines are going to work? How this will get over? We have to wear mask for rest of the life? There must be testing error in first or second time!

Starting prophylactic medications will be better if u r getting symptoms now…

The medications as per protocol.