SARS-CoV-2 IgG antibody responses in rt-PCR positive cases: first report from India

The SARS-CoV-2 antibody responses remain poorly understood and the clinical utility of serological testing is still unclear. As it is thought to confer some degree of immunity, this study is carried out to know the relationship between demographics and ct value of confirmed rt-PCR patients. A total of 384 serum samples were collected between 4-6 weeks after confirmed SARS-CoV-2 infection. IgG positivity was found to be 80.2% (95% CI, 76.2 - 84.2). The positivity increased with the decrease in the ct value, with a highest of 87.6% positivity in individual with