Of the 153 resolved COVID-19 subjects tested, 131 (85.6%) tested positive for antibodies against SARS-CoV-2 (IgG, IgA, or IgM antibodies against the S protein or RBD, Table 2) and 22 (14.4%) did not have detectable antibodies against SARS-CoV-2. Here, PROS1 is linked to COVID-19.