Figure 3

Odds ratio for six different seasonal strain delays with R ₀ = 1.5. Odds ratio versus effective vaccination coverage for six different delays from seasonal strain introduction to pandemic strain introduction. All calculations are with R₀ = 1.5 and 1/δ = 120 days. Delays of 120 days or less correspond to a first wave scenario, the delay of 240 days corresponds to a second wave only scenario. The symbols on the lines are to aid in differentiating the line types and not a specific data point of interest.