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Table 2 Test results as a function of time following an initial positive result

From: Duration of SARS-CoV-2 sero-positivity in a large longitudinal sero-surveillance cohort: the COVID-19 Community Research Partnership

 

Baseline*

Month 1

Month 2

Month 3

Month 4

Month 5

Month 6

 > 6 Months

 

n

n

%

n

%

n

%

n

%

n

%

n

%

n

%

Seropositive cohort

              

IgM

               

 Negative

0

59

48.8%

257

61.8%

255

78.7%

227

88.0%

155

93.4%

168

92.3%

99

93.4%

 Positive

973

62

51.2%

159

38.2%

69

21.3%

31

12.0%

11

6.6%

14

7.7%

7

6.6%

IgG

               

 Negative

0

23

41.1%

73

38.6%

57

57.6%

79

71.2%

34

75.6%

38

95.0%

17

70.8%

 Positive

532

33

58.9%

116

61.4%

42

42.4%

32

28.8%

11

24.4%

2

5.0%

7

29.2%

IgG or IgM

               

 Negative

0

63

42.6%

255

52.4%

264

73.3%

254

83.6%

163

88.6%

181

92.3%

107

89.9%

 Positive

1172

85

57.4%

232

47.6%

96

26.7%

50

16.4%

21

11.4%

15

7.7%

12

10.1%

IgG and IgM

               

 Negative

0

19

65.5%

74

64.4%

44

71.0%

52

81.3%

23

85.2%

25

96.2%

8

72.7%

 Positive

330

10

34.5%

41

35.7%

18

29.0%

12

18.8%

4

14.8%

1

3.9%

3

27.3%

Subset with initial positive IgG and IgM

           

IgG and IgM

               

 Negative

0

19

65.5%

74

64.4%

44

71.0%

52

81.3%

23

85.2%

25

96.2%

8

72.7%

 Positive

330

10

34.5%

41

35.7%

18

29.0%

12

18.8%

4

14.8%

1

3.9%

3

27.3%

IgG or IgM

               

 Negative

0

13

44.8%

44

38.3%

33

53.2%

38

59.4%

17

63.0%

22

84.6%

6

54.6%

 Positive

330

16

55.2%

71

61.7%

29

46.8%

26

40.6%

10

37.0%

4

15.4%

5

45.5%

Subset with negative test ≤ 60 days prior

           

IgG or IgM

               

 Negative

0

38

52.1%

90

65.7%

58

69.1%

48

72.7%

47

79.7%

36

85.7%

31

83.8%

 Positive

371

35

48.0%

47

34.3%

26

31.0%

18

27.3%

12

20.3%

6

14.3%

6

16.2%

  1. *Defined as the first positive test