I was infected 3 times in last 9 months, according to my IgG level. First time I was one day away of hospitalization, 20% lungs damaged. Second time it was 37.1

I was infected 3 times in last 9 months, according to my IgG level. First time I was one day away of hospitalization, 20% lungs damaged. Second time it was 37.1C temperature for 3 days (for those from imperial system, norm in 36.9) and no other symptoms. Third time I didn't notice at all.