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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