Table 1 Community COVID-19 prevalence and asymptomatic carriage in pregnant women
Author | Region/Country | Type of study | Peak daily case load at start of the study period for relevant area | Max daily case load during study period for relevant area | Peak daily case load the end of the study period for relevant area | Number of pregnant women in study | Number tested positive | Number asymptomatic at the time of admission AND tested positive | Test positivity % | Proportion of asymptomatic test positive % |
|---|---|---|---|---|---|---|---|---|---|---|
Fassett | California, USA | Observational retrospective study | 1261 | 1921 | 1921 | 3923 | 17 | 17 | 0.43 | 100.00 |
Gagliardi | North of Tuscany and Liguria, Italy | Case series | 5210 | 6153 | 4053 | 533 | 3 | 2 | 0.56 | 66.67 |
Herraiz | Madrid, Spain | Observational retrospective study | 6278 | 6740 | 2610 | 203 | 2 | 1 | 0.99 | 50.00 |
Naqvi | California, USA | Case series | 1104 | 1331 | 1268 | 82 | 1 | 0 | 1.22 | 0.00 |
LaCourse | Washington, USA | Retrospective cohort | 2 | 437 | 314 | 188 | 5 | 1 | 2.66 | 20.00 |
Ceulemans | North East Flanders, Belgium | Case series | 683 | 2319 | 426 | 470 | 13 | 8 | 2.77 | 61.54 |
Miller | Illinois, USA | Case series | 1150 | 2023 | 2023 | 635 | 23 | 10 | 3.62 | 43.48 |
Ochiai | Tokyo, Japan | Retrospective analysis | 383 | 743 | 203 | 52 | 2 | 2 | 3.85 | 100.00 |
Campbell | Connecticut, USA | Case series | 377 | 1100 | 620 | 770 | 30 | 22 | 3.90 | 73.33 |
Khalil | London, UK | Cohort study | 822 | 1071 | 434 | 129 | 9 | 8 | 6.98 | 88.89 |
Yassa | Istanbul, Turkey | Prospective cohort | 2131 | 2936 | 1035 | 296 | 23 | 12 | 7.77 | 52.17 |
Prabhu | New York, USA | Prospective cohort | 2166 | 9909 | 6693 | 675 | 70 | 55 | 10.37 | 78.57 |
Doria | Senhora da Hora, Portugal | Case series | 302 | 1516 | 514 | 103 | 12 | 11 | 11.65 | 91.67 |
Sutton | New York, USA | Cohort study | 2166 | 8775 | 8775 | 215 | 33 | 29 | 15.40 | 87.60 |
Buckley | New York, USA | Case series | 9073 | 9909 | 8064 | 307 | 50 | 50 | 16.29 | 100.00 |
Vintzileos | New York, USA | Retrospective cohort | 6555 | 9909 | 9410 | 161 | 32 | 21 | 19.88 | 65.63 |
London | New York, USA | Retrospective cohort | 73 | 9909 | 8064 | 156 | 68 | 22 | 43.58 | 32.35 |