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Table 3 Distribution per season of the number of severe acute respiratory infections (SARI) hospitalizations and deaths, SARI Influenza-related hospitalizations and deaths, influenza vaccine effectiveness and vaccine coverage estimates for ≥65 years and < 65 years with a chronic condition

From: Impact of national influenza vaccination strategy in severe influenza outcomes among the high-risk Portuguese population

Season features2014/152015/162016/17
Epidemic periodw1 to w7/2015w53/2015 to w7/2016w48/2016 to w1/2017
Dominant type/subtypeB/YamAH1N1pdm09AH3
SARI Hospitalizations
  ≥ 65 years (n)24,72021,91318,724
 Chronic condition (n)437945953231
SARI deaths
  ≥ 65 years (n)382430442942
  < 65 years with a chronic condition (n)198196137
Influenza hospitalizations
  ≥ 65 years674251076003
  < 65 years with a chronic condition120410691031
Influenza deaths
  ≥ 65 years1078731909
  < 65 years with a chronic condition564742
Influenza vaccine effectiveness (IVE %)
  ≥ 65 years[95%CI]29.0 [14.7 to 43.4]49.1 [26.4 to 71.7]42.9 [33.0 to 52.8]
  < 65 years [95%CI]46.1 [20.9 to 71.3]53.0 [34.9 to 71.1]58.9 [38.1 to 79.6]
Vaccine coverage (VC %)
  ≥ 65 years[95%CI]49.8 [41.3 to 58.4]50.1 [42.1 to 58.1]57.5 [50.8 to 64.1)
 Chronic condition [95%CI]34.2 [28.1 to 40.9]32.3 [26.8 to 38.4]39.7 [33.7 to 45.9]
  1. SARI severe acute respiratory infections, w week, IVE influenza vaccine effectiveness, CI confidence intervals, VC vaccine coverage