Me and my father was corona positive in the month of December today we have conducted a corona antibody igg report my covid igg value shows 0.97 my father's covid igg value shows 0.50 my query is why antibody does not appear in our bodies we were not asymptomatic, it took almost 23 to 25 days to recover even my condition was so bad I was suffering for almost 13 days with high fever of almost 102 or 103 my query is should we have to take a vaccine every 3 to 6 six months to prevent this disease b coz antibodies will again disappear from body after few time how many dose of vaccine is enough to maintain the antibody level in our body.