SARS-Cov-2 IgG positive rates were comparable among mild,
moderate and severe COVID-19 patients
The novel coronavirus nucleic acid test of 56 cases of patients was
negative. The SARS-Cov-2 IgM titer was average 0.39 (0.19-0.65) , the
SARS-Cov-2 IgM titer among mild, moderate and severe patients were
incomparable ( P = 0.644, Table 2 ) . The positive rate of SARS-Cov-2
IgM titer in severe group was higer than others, while incomparable ( P
= 0.266, Table 2 ) in the three groups. The SARS-Cov-2 IgG titer was
average 0.72 ( 0.84-17.50 ) , the SARS-Cov-2 IgG titer among mild,
moderate and severe patients were incomparable ( P = 0.079, Table 2 ) .
The positive rate of SARS-Cov-2 IgG titer within 6 to 9 months after
discharge is 73.2%, while the positive rate of SARS-Cov-2 IgG titer was
comparable ( P = 0.01, Table 2 ) in the mild and moderate groups.
Comparing the data of the three groups of patients, we found that the
IgG level of the moderate and severe groups was significantly higher
than that of the mild group ( Table 2 ) . Thus, SARS-Cov-2 IgG positive
rates were comparable among mild, moderate and severe COVID-19 patients
during 6-9 months follow-up.