Skip to main content

Table 2 The number of both primary and secondary influenza cases by age group, family member category, influenza vaccination, and antiviral drug prescriptions

From: Analysis of influenza transmission in the households of primary and junior high school students during the 2012–13 influenza season in Odate, Japan

  No. of total influenza cases (%) No. of primary cases (%) No. of secondary cases (%)
Total 589 366 223
Age groupa    
  <5 years 26 (4.4) 8 (2.2) 18 (8.1)
  5–9 years 138 (23.5) 101 (27.7) 37 (16.6)
  10–19 years 302 (51.4) 228 (62.6) 74 (33.2)
  20–49 years 91 (15.5) 23 (6.3) 68 (30.5)
  50–64 years 12 (2.0) 1 (0.3) 11 (4.9)
  >65 years 18 (3.1) 3 (0.8) 15 (6.7)
Category    
  Preschool 38 (6.5) 17 (4.6) 21 (9.4)
  Primary school 273 (46.3) 204 (55.7) 69 (30.9)
  Junior high school 146 (24.8) 113 (30.9) 33 (14.8)
  High school 11 (1.9) 5 (1.4) 6 (2.7)
  Father 36 (6.1) 10 (2.7) 26 (11.7)
  Mother 54 (9.2) 11 (3.0) 43 (19.3)
  Grandparents and other adults 31 (5.3) 6 (1.6) 25 (11.2)
Seasonal influenza vaccination 258 (43.9) 161 (44.2) 93 (43.5)
Antiviral drug prescription 558 (95.1) 364 (94.8) 212 (95.1)
  1. a The total number of primary influenza cases to calculate the percentage by age group was 364