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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 <20 ct value. The mean (SD) ct value of IgG positives and negatives was 23.34 (+/-6.09) and 26.72 (+/- 7.031) respectively. There was no significant difference found between the demographic characteristics such as age, sex, symptoms and antibody response. The current study is first of its kind wherein we have assessed the correlation of ct of RT-PCR with development of IgG against SARS-CoV-2. Our study showed that although Ct value might not have any relation with severity of the diseases but is associated with the antibody response among the SARS-CoV-2 infected individual.
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10.1101/2020.11.13.20229716
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document_parses/pdf_json/a71b07297f5d049ff5f2b390cc387ef36efa4f73.json
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SARS-CoV-2 IgG antibody responses in rt-PCR positive cases: first report from India
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