Effects of vaccination and population structure on influenza epidemic spread in the presence of two circulating strains

Table 2 Total attack rates for 2-age class network model

听	听	Attack rates: Prior vaccination V₀= 0.2, 蠅₀ = 0.0			Attack rates: Vaccination during epidemic: V₀= 0, 蠅₀ = 1.0
未	T*	Strain 1+2	Strain 1	Strain 2	Strain 1+2	Strain 1	Strain 2
0.9	10	0.149929	0.229126	0.178316	0.141735	0.393720	0.083434
0.9	60	0.115638	0.279763	0.117244	0.000858	0.541612	0.000404
0.4	10	0.037663	0.338132	0.082410	0.008601	0.528141	0.010630
0.4	60	0.000463	0.398912	0.000749	0.000001	0.542568	0.000003

For the 2-age class network model, the initial strain-1 infection occurs in a fraction 蔚₁ = 0.5 of individuals in class (k₁,a₁) = (5,1), and initial strain-2 infection, occurs at time T* = 10 or 60 days later, in a fraction 蔚₂ = 0.5 of individuals in class (k₂,a₂) = (10,2). For these conditions, and the given degree- and age-distributions, the initial number of strain-1 and strain-2 infections (introduced at times t = 0 and T*, respectively) in a population of size N =10,000, is 67 and 12, respectively.

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