Table 2. Estimates of vaccine effectiveness (VE) for the prevention of influenza A-associated outcomes in community-dwelling Ontario residents aged ≥65 years (95% confidence interval [CI]) during weeks when 5% or 10% of respiratory specimens tested positive for influenza viruses.

Excess influenza-associated outcome	5% Circulation VE (95% CI)	10% Circulation VE (95% CI)
All-cause deaths	22% (−6, 42)	23% (−5, 42)
30-day pneumonia/influenza deaths	25% (13, 37)	26% (13, 38)
Pneumonia/influenza hospitalizations	19% (4, 31)	20% (6, 33)