Table 5 Changes in the seroprevalence between day 0 and 6 months.

From: Neutralising SARS-CoV-2 RBD-specific antibodies persist for at least six months independently of symptoms in adults

Test

Ratio

p-value (against day 0)

Neg → pos (%neg)

Pos → neg (%pos)

Difference of prevalence (%)

S1-specific IgG

1.56

0.212

2.0

55.2

0.7

S1-specific IgA

0.33

<0.001

2.6

70.8

−4.8

RBD-specific IgM

2.88

0.012

1.8

53.3

1.2

RBD-specific total antibodies

>54

<0.001

2.1

0.0

2.1

NCP-specific IgG

3.00

0.014

1.6

50.0

1.1

  1. Changes are indicated by the ratio of newly positives to those that became negative; and the proportion of negatives that became positive (neg → pos) as well as the proportion of positives that became negative (pos → neg) and difference of prevalences of positives at month 6 and day 0; p-value assessed by Chi² McNemar. S1 subunit of spike protein (S1), receptor-binding domain (RBD), nucleocapsid (NCP).
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