Seroprevalence of IgM/IgG and Neutralizing Antibodies against SARS-CoV-2 in Unvaccinated Young Adults from Mexico Who Reported Not Having Had a Previous COVID-19 Infection
Table 2
Rapid test and NAbs for SARS-CoV-2.
Test
Total unvaccinated young adults n = 171
Prior COVID-19 by self-report
value
Yes 21.05% (n = 36)
No 78.94% (n = 135)
Rapid antibody test
Negative
42.6% (73/171)
13.9% (5/36)
50.4% (68/135)
<0.0001
Positive
57.3% (98/171)
86.1% (31/36)
49.6% (67/135)
IgM
3.1% (3/98)
0% (0/31)
4.5% (3/67)
0.488
IgM + IgG
9.2% (9/98)
9.7% (3/31)
8.9% (6/67)
IgG
87.8% (86/98)
90.3% (28/31)
86.6% (58/67)
Neutralizing antibodies
Negative (<30%)
42.7% (73/171)
8.3% (3/36)
51.9% (70/135)
<0.0001
Positive (>30%)
57.3% (98/171)
91.7% (33/36)
48.1% (65/135)
% neutralization
48.36 (9.415–96.01)
94.3 (68.14–96.96)
26.07 (6.035–93.130)
<0.0001
-values were calculated by Fisher’s exact, the Mann–Whitney U (%(n)) or chi-square test for the groups (median (IQR)).
