Table 1.

Parameters and initial values of the SEILR system (1).

Symbol	Definition	Initial Value	Reference
K	Number of age groups	3
Ni	Subgroup population size
	$N_{total}$	14 566 547	[58]
	$N_1$: (0-19)	3 141 693	[58]
	$N_2$: (20-59)	7 977 131	[58]
	$N_3$: (60+)	3 447 723	[58]
cij	Number of daily contacts with Group j per member of Group i	Table 2
p	Transmission probability per contagious contact	Section 2.5
βij	Effective contact-rate, i,j ∈ {1,…,K}	cij⁎p
σ	Time from exposure until contagious (days)	1/2.5	[32]
ψ	Time from contagious until symptomatic (days)	1/3.5a	[32], [59]
α1	Proportion of permanently asymptomatic cases in N1	0.963	[35]
α2	Proportion of permanently asymptomatic cases in N2	0.7	[35]
α3	Proportion of permanently asymptomatic cases in N3	0.35	[35]
ϵ	Proportion of compliance with isolation	0.95	assumption
κ	Isolation delay	1	assumption
γ	Recovery/removal rate	1/7	[31]

^aThe parameter ψ is estimated from the relationship 1/σ + 1/ψ = incubation period, where 1/σ = 2.5 days and incubation period = 6 days.