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Table 1 Selection of patients and results of RT-PCR

From: Influenza epidemiology and influenza vaccine effectiveness during the 2014–2015 season: annual report from the Global Influenza Hospital Surveillance Network

  St. Petersburg Moscow Czech Republic Turkey Beijing Valencia Total
Category n % n % n % n % n % n % n %
Screened admissions 3164   1934   123   1409   1425   12,496   20,551  
Exclusion criteria
 Non resident 21 0.7 95 4.9 12 9.8 73 5.2 5 0.4 50 0.4 256 1.2
 Institutionalised 14 0.4 14 0.7 2 1.6 17 1.2 2 0.1 800 6.4 849 4.1
 Previous discharge <30 days 31 1.0 51 2.6 8 6.5 216 15.3 13 0.9 2283 18.3 2602 12.7
 Unable to communicate 20 0.6 47 2.4 2 1.6 125 8.9 0 0.0 782 6.3 976 4.7
 Not giving consent 100 3.2 32 1.7 14 11.4 47 3.3 15 1.1 504 4.0 712 3.5
 No ILI symptoms ≥5 years of age 19 0.6 25 1.3 1 0.8 131 9.3 18 1.3 2903 23.2 3097 15.1
 Admission within 7 days of symptoms onset 181 5.7 150 7.8 4 3.3 110 7.8 44 3.1 745 6.0 1234 6.0
 Previous influenza infection 1 0.0 0 0.0 0 0.0 7 0.5 0 0.0 1 0.0 9 0.0
 Onset of symptoms to swab >9 days 0 0.0 1 0.1 0 0.0 2 0.1 0 0.0 1 0.0 4 0.0
 Sample inadequate 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 5 0.0 5 0.0
 Sample lost 0 0.0 0 0.0 0 0.0 0 0.0 1 0.1 1 0.0 2 0.0
 Recruited outside periods with continuous influenza positive admissions 31 1.0 115 5.9 1 0.8 65 4.6 178 12.5 764 6.1 1154 5.6
Included with valid laboratory results 2715 85.8 1400 72.4 79 64.2 614 43.6 1149 80.6 3657 29.3 9614 46.8
RT-PCR result
 Influenza negative 2113 77.8 966 69.0 20 25.3 543 88.4 875 76.2 2920 79.8 7437 77.4
 Influenza positive 602 22.2 434 31.0 59 74.7 71 11.6 274 23.8 737 20.2 2177 22.6
 Subtype and lineagea
  A(H1N1)pdm09 47 7.8 30 6.9 7 11.9 26 36.6 1 0.4 10 1.4 121 5.6
  A(H3N2) 267 44.3 163 37.6 33 55.9 6 8.5 163 59.5 611 82.9 1243 57.1
  A not subtyped 48 8.0 9 2.1 2 3.3 0 0.0 0 0.0 47 6.4 106 4.9
  B/Yamagata lineage 258 42.9 175 40.3 16 27.1 0 0.0 109 39.8 65 8.8 623 28.6
  B/Victoria lineage 0 0 10 2.3 0 0 0 0.0 1 0.4 0 0.0 11 0.5
  B not subtypedb 0 0 52 12.0 2 3.4 39 54.9 0 0.0 4 0.5 97 4.5
  1. Abbreviations: ILI, influenza-like disease; RT-PCR, reverse transcriptase-polymerase chain reaction
  2. aBecause there were 24 mixed infections, each involving two different influenza viruses, the sum by strain may be greater than the number of patients included with lab results. Percentages are reported by total of influenza-positive cases
  3. bFor Turkey and Valencia, all B not subtyped were assumed to be B/Yamagata lineage based on virus circulation at these sites. This assumption was not applied for Moscow because of a mixed pattern of influenza B circulation