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Table 2 Age-specific model parameters with the following sources: the age-specific values of vaccine efficacy and effectiveness [8, 9], fraction of the symptomatic infectives [15] and [28], and all other values from 2003-2006 Taiwan flu monitor surveillance data.

From: Age groups and spread of influenza: implications for vaccination strategy

parameter\age group 0-2 3-5 6-7 8-14 15-21 22-64 ≥ 65
time-dependent vaccination rate ν i (t) υ 1 (t) 0 0 0 0 0 υ 7 (t)
vaccine efficacy π i [8, 9] 0.7 0.7 0.7 0.7 0.5 0.5 0.4
fraction of asymptomatic infectives α i [15, 28] 0.5 0.5 0.5 0.5 0.5 0.5 0.7
reduced fraction of asymptomatic infectives due to vaccination [8, 9] 0.4 0.4 0.4 0.4 0.4 0.4 0.6
mortality rate of untreated infectives δ i 6 × 10-4 5 × 10-4 5 × 10-5 5 × 10-5 5 × 10-5 1 × 10-4 0.002
mortality rate of untreated vaccinated infectives * 6 × 10-4 5 × 10-4 5 × 10-5 5 × 10-5 5 × 10-5 1 × 10-4 0.002
mortality rate of hospitalized infectives 0.006 0.005 5 × 10-4 5 × 10-4 5 × 10-4 0.001 0.02
mean recovery rate of the hospitalized infectives ρ 1 1/4.85 1/4.72 1/4.45 1/4.56 1/5.55 1/9.16 1/16.94
hospitalization rate of unvaccinated symptomatic infectives h i 0.007 0.007 0.007 0.007 0.007 0.007 0.09
hospitalization rate of vaccinated symptomatic infectives * 0.007 0.007 0.007 0.007 0.007 0.007 0.06
per contact transmission probability of infectees in i th group β ij β i 0.047 0.039 0.031 0.031 0.047 0.045 0.155
per contact transmission probability of infectors in i th group β ij β j 0.083 0.029 0.045 0.008 0.040 0.056 0.078
  1. *Note that h i and δ i .
  2. The last four rows (in bold) were obtained by least-squared curve-fitting with data using MATLAB software.