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Table 1 Influenza infection status in pregnant admissions

From: Epidemiology of influenza in pregnant women hospitalized with respiratory illness in Moscow, 2012/2013–2015/2016: a hospital-based active surveillance study

  n (%)
  2012/2013 2013/2014 2014/2015 2015/2016 All seasons
RT-PCR result N = 520 N = 335 N = 296 N = 597 N = 1748
RT-PCR result
 Positivea 253 (48.7) 149 (44.5) 155 (52.4) 268 (44.9) 825 (47.2)
 Negative 267 (51.3) 186 (55.5) 141 (47.6) 329 (55.1) 923 (52.8)
Influenza type
 A(H1N1)pdm09 155 (61.3) 13 (8.7) 11 (7.1) 182 (67.9) 361 (43.8)
 A(H3N2) 41 (16.2) 100 (67.1) 62 (40.0) 21 (7.8) 224 (27.2)
 B/Yamagata lineage 6 (2.4) 34 (22.8) 66 (42.6) 0 (0.0) 106 (12.8)
 B/Victoria lineage 10 (4.0) 2 (1.3) 5 (3.2) 59 (22.0) 76 (9.2)
 A not subtyped 5 (2.0) 0 (0.0) 1 (0.6) 2 (0.7) 8 (1.0)
 B undetermined lineage 36 (14.2) 0 (0.0) 10 (6.5) 4 (1.5) 50 (6.1)
  1. Abbreviation: RT-PCR reverse transcription-polymerase chain reaction
  2. aTest of homogeneity (equal odds) between seasons: p = 0.1176