Table 1 Baseline model parameter values, meaning and sources.
Parameter | Symbol | Value/Range | References |
|---|---|---|---|
Number of household contacts between subgroups | \({h}_{{ij}}\) | Estimated from accommodation data | |
Number of study contacts between subgroups | \({s}_{{ij}}\) | 20.0 (SD: 4.0) | |
Number of university-wide contacts between subgroups | \({r}_{{ij}}\) | 4.3 (SD: 1.0) | |
Basic reproduction number in the UK | \({R}_{0}\) | 2.7 | |
Transmission probability per contact per day | \(\beta\) | Estimated from reproduction number | |
Proportion of cases with no symptoms | \(f\) | 0.75 | |
Average infectious period | \(1/\gamma\) | 3 days | |
Average incubation period | \(1/\sigma\) | 3 days | |
Average pre-symptomatic period | \(1/{\gamma }_{P}\) | 2 days | |
Average infectious period for asymptomatic case | \(1/{\gamma }_{A}\) | \(1/{\gamma }_{P}+1/\gamma\) | |
Average time to test for symptomatic cases | \(1/{\tau }_{I}\) | 2 days | |
Average time to test for asymptomatic cases | \(1/{\tau }_{A}\) | Asymptomatic cases not tested in baseline model | |
Length of time in self-isolation | \(1/{\gamma }_{Q}\) | 14 days | |
Relative infectiousness of asymptomatic cases compared to symptomatic cases | \(\varepsilon\) | 0.5 (0.3–0.7) | |
Reduction in infectiousness whilst in self-isolation | \({\varepsilon }_{Q}\) | 0.5 | Assumption |
Background rate of infection | \(b\) | – | Assumption |
