Thus, immediately after admission (up to 7 days after infection), IgA was positive only in 52% and IgG in 28.99% of all PCR-positive patients from cohort A. In the samples collected during the period from 14 to 21 days after admission to the hospital, the positivity of serological tests rose to 98.75% and 95% in the IgA and IgG antibodies, respectively. This evidence concerns the gene CD79A and infection.