Table 2 Monthly estimates of cord blood samples with detectable SARS-CoV-2 IgA and/or IgM (N = 1038)

From: Cord blood IgA/M reveals in utero response to SARS-CoV-2 with fluctuations in relation to circulating variants

Month

No. +IgM/A

Total N

Estimatea

Wald 95% Confidence Intervals

Oct-21

4

18

0.222

0.030

0.414

Nov-21

6

37

0.162

0.043

0.281

Dec-21

10

40

0.250

0.116

0.384

Jan-22

14

62

0.226

0.122

0.330

Feb-22

18

50

0.360

0.227

0.493

Mar-22

11

41

0.268

0.133

0.404

Apr-22

20

62

0.323

0.206

0.439

May-22

18

73

0.247

0.148

0.345

Jun-22

13

57

0.228

0.119

0.337

Jul-22

21

76

0.276

0.176

0.377

Aug-22

27

105

0.257

0.174

0.341

Sep-22

39

80

0.488

0.378

0.597

Oct-22

12

49

0.245

0.124

0.365

Nov-22

21

66

0.318

0.206

0.431

Dec-22

14

66

0.212

0.113

0.311

Jan-23

40

108

0.370

0.279

0.461

Feb-23

10

48

0.208

0.093

0.323

  1. aEstimate: The proportion with detectable SARS-CoV-2 IgA and/or IgM.
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