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Table 1 Exclusions, inclusions, and RT-PCR results for included admissions

From: Influenza epidemiology and influenza vaccine effectiveness during the 2015–2016 season: results from the Global Influenza Hospital Surveillance Network

Category

n (%)

St. Petersburg

Moscow

Czech Republic

Turkey

France

Beijing

Valencia

Mexico

India

Fortaleza

Curitiba

Total

N = 2247

N = 2457

N = 248

N = 1351

N = 169

N = 2947

N = 6795

N = 1034

N = 371

N = 157

N = 584

N = 18,360

Excluded from the analysis

 Non-resident

10 (0.4)

84 (3.4)

1 (0.4)

10 (0.7)

0 (0.0)

1 (<  0.1)

25 (0.4)

249 (24.1)

5 (1.3)

3 (1.9)

0 (0.0)

388 (2.1)

 Institutionalized

0 (0.0)

32 (1.3)

6 (2.4)

25 (1.9)

0 (0.0)

2 (0.1)

0 (0.0)

5 (0.5)

0 (0.0)

1 (0.6)

3 (0.5)

74 (0.4)

 Unable to communicate

20 (0.9)

112 (4.6)

14 (5.6)

96 (7.1)

0 (0.0)

0 (0.0)

59 (0.9)

56 (5.4)

0 (0.0)

0 (0.0)

65 (11.1)

422 (2.3)

 Did not provide consent

80 (3.6)

26 (1.1)

21 (8.5)

11 (0.8)

0 (0.0)

0 (0.0)

16 (0.2)

40 (3.9)

1 (0.3)

0 (0.0)

3 (0.5)

198 (1.1)

 Previous discharge from hospital < 30 d

11 (0.5)

80 (3.3)

6 (2.4)

266 (19.7)

25 (14.8)

24 (0.8)

66 (1.0)

208 (20.1)

9 (2.4)

47 (29.9)

89 (15.2)

831 (4.5)

 No ILI symptoms, ≥ 5 y of agea

0 (0.0)

34 (1.4)

60 (24.2)

3 (0.2)

2 (1.2)

0 (0.0)

3708 (54.6)

60 (5.8)

0 (0.0)

19 (12.1)

0 (0.0)

3886 (21.2)

 Swabbed > 7 d after onset of symptoms (all ages)b

55 (2.4)

134 (5.5)

16 (6.5)

72 (5.3)

0 (0.0)

28 (1.0)

226 (3.3)

237 (22.9)

17 (4.6)

18 (11.5)

218 (37.3)

1021 (5.6)

 Sample inadequatec

0 (0.0)

0 (0.0)

0 (0.0)

0 (0.0)

0 (0.0)

0 (0.0)

2 (<  0.1)

0 (0.0)

0 (0.0)

0 (0.0)

0 (0.0)

2 (<  0.1)

 Previous influenza infectiond

3 (0.1)

1 (<  0.1)

1 (0.4)

2 (0.1)

0 (0.0)

0 (0.0)

2 (<  0.1)

0 (0.0)

2 (0.5)

0 (0.0)

0 (0.0)

11 (0.1)

 Recruited in weeks without laboratory-confirmed influenza cases

0 (0.0)

0 (0.0)

0 (0.0)

57 (4.2)

1 (0.6)

735 (24.9)

547 (8.1)

83 (8.0)

7 (1.9)

69 (43.9)

25 (4.3)

1524 (8.3)

Included in the analysis

2071 (92.2)

1934 (78.7)

124 (50.0)

704 (52.1)

141 (83.4)

2157 (73.2)

2145 (31.6)

96 (9.3)

331 (89.2)

0 (0.0)

179 (30.7)

9882 (53.8)

RT-PCR result

 Negative for influenza

1331 (64.3)

1256 (64.9)

82 (66.1)

561 (79.7)

97 (68.8)

1804 (83.6)

1828 (85.2)

51 (53.1)

294 (88.8)

0 (0.0)

163 (27.9)

7467 (75.6)

 Positive for influenza

740 (35.7)

678 (35.1)

42 (33.9)

143 (20.3)

44 (31.2)

353 (16.4)

317 (14.8)

45 (46.9)

37 (11.2)

0 (0.0)

16 (2.7)

2415 (24.4)

 Influenza A(H1N1)pdm09

527 (25.4)

462 (23.9)

23 (18.5)

68 (9.7)

25 (17.7)

108 (5.0)

163 (7.6)

21 (21.9)

5 (1.5)

0 (0.0)

13 (2.2)

1415 (14.3)

 Influenza A(H3N2)

16 (0.8)

44 (2.3)

2 (1.6)

56 (8.0)

1 (0.7)

82 (3.8)

3 (0.1)

13 (13.5)

18 (5.4)

0 (0.0)

0 (0.0)

235 (2.4)

 Influenza A/not subtyped

104 (5.0)

11 (0.6)

1 (0.8)

10 (1.4)

0 (0.0)

0 (0.0)

50 (2.3)

4 (4.2)

0 (0.0)

0 (0.0)

0 (0.0)

180 (1.8)

 Influenza B/Yamagata

2 (0.1)

1 (0.1)

8 (6.5)

11 (1.6)

0 (0.0)

12 (0.6)

0 (0.0)

2 (2.1)

9 (2.7)

0 (0.0)

0 (0.0)

45 (0.5)

 Influenza B/Victoria

96 (4.6)

153 (7.9)

8 (6.5)

0 (0.0)

16 (11.3)

155 (7.2)

92 (4.3)

4 (4.2)

5 (1.5)

0 (0.0)

3 (0.5)

532 (5.4)

 Influenza B/not subtyped

8 (0.4)

7 (0.4)

1 (0.8)

1 (0.1)

2 (1.4)

0 (0.0)

12 (0.6)

2 (2.1)

0 (0.0)

0 (0.0)

0 (0.0)

33 (0.3)

  1. Abbreviations: ILI influenza-like illness, RT-PCR reverse transcriptase-polymerase chain reaction
  2. a9 missing for Turkey
  3. b98 missing for Turkey
  4. c21 missing for Moscow, 1 for India, and 2 for Curitiba
  5. d21 missing for Moscow