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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