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 | |
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% |
TQ | Duration of quarantine starting at t0 | 7, 10, 14 days |
tk | Time of test k | 6 days pre-departure to 7 days post-arrival |
ρ(tk, τ) | Probability of a positive test | Functions shown in Fig. 1b |
ϵ(τ) | Risk of infection | Uniform distribution |