Reducing travel-related SARS-CoV-2 transmission with layered mitigation measures: symptom monitoring, quarantine, and testing

Table 1 Model parameters

Variable	Definition	Values used
t	Time of transmission risk from traveler relative to time of travel	Ranges: 0–1 days while traveling, 0–28 days after travel
τ	Time of infection risk to traveler relative to time of travel	0 or ranges: 1–7 days pre-departure, 1–7 days pre-arrival
I(t, τ)	Infectiousness	Functions shown in Fig. 1a [27, 51, 59]
σ₀	Proportion of infected individuals that develop symptoms	70%, 50%
σ(t, τ)	Cumulative probability of developing symptoms among individuals who develop symptoms	Log-Normal cumulative distribution function [61]
t₀	Time of quarantine relative to the time of travel	0
∝_Q	Adherence to quarantine	100%, 50%
T_Q	Duration of quarantine starting at t₀	7, 10, 14 days
t_k	Time of test k	6 days pre-departure to 7 days post-arrival
ρ(t_k, τ)	Probability of a positive test	Functions shown in Fig. 1b
ϵ(τ)	Risk of infection	Uniform distribution

ISSN: 1741-7015