From: Incidence of influenza virus infection among pregnant women: a systematic review
Study | Number of cases | Denominator | Crude incidence rate (CI) | 95% CI | Pandemic or seasonal? | Study design | Grading system and scoreb | Hospital-based or clinic-based? | Duration of surveillance (months or years) | Country |
---|---|---|---|---|---|---|---|---|---|---|
Jamieson 2009 | 14 | 3,392,060 | 0.04 per 10,000 pregnancies | (0.02–0.07) | Pandemic | Case series | JBI = 6/7 | Both | 1 month | US |
Creanga 2010 | 63 | 113,877 | 5.5 per 10,000 pregnancies | (4.25–7.08) | Pandemic | Case series | JBI = 6/7 | Hospital | 2 months | US |
Yates 2010 | 241 | 314,135 | 7.7 per 10,000 pregnancies | (6.7–8.7) | Pandemic | Case series | NOS = 9 | Hospital | 5 months | UK |
Doyle 2013 | 170 | 295,941 | 5.7 per 10,000 pregnanciesa | (4.94–6.68) | Pandemic | Case series | NOS = 8 | Both | 13 months | US |