. 2020 Aug 12;140:110164. doi: 10.1016/j.chaos.2020.110164

Table 1.

Variables and parameters (with their meaning) of the model with initial conditions and predefined values, respectively.

Variable	Meaning	Initial condition
N	Country population.	Depends on the country
S	Individuals susceptible to infection.	$S (t_{0}) = N - E (t_{0}) - C (t_{0}) / (1 - β)$
E	Exposed individuals, latent cases.	Adjusted from data
I_s	Symptomatic infectious cases.	$I_{s} (t_{0}) = C (t_{0})$
I_a	Asymptomatic and mild infectious cases.	$I_{a} (t_{0}) = β C (t_{0}) / (1 - β)$
Q	Isolated individuals.	$Q (t_{0}) = 0$
R	Recovered individuals. Became imune.	$R (t_{0}) = 0$
C	Total of confirmed cases.	WHO data [1]
Parameter	Meaning	Class
$T_{s e r} = 7.5$	Serial interval.	Predefined [34]
$T_{l a t} = 5.2$	Mean incubation period.	Predefined [16], [34]
$T_{i n f} = 2.3$	Infectious period. $T_{i n f} = T_{s e r} - T_{l a t}$	Predefined [16]
$α = 1$	Ratio between infectiousness of I_a and I_s.	Predefined
$β = 0.8$	Population ratio which remains asymptomatic.	Predefined [1]
$θ = γ R_{0}$	R₀ the reproduction number, γ is the interaction factor.	Adjustable/Strategies
κ_s	Isolation rate of symptomatic individuals.	Adjustable/Strategies
κ_a	Isolation rate of asymptomatic individuals.	Strategies