Table 2 SARS-CoV-2 transmission model variables and parameters

\(S(t)\)

Proportion of susceptible population at time \(t\)

\({L}_{a}(t)\)

Proportion of asymptomatic latent population at time \(t\)

\({L}_{s}(t)\)

Proportion of symptomatic latent population at time \(t\)

\({I}_{a}(t)\)

Proportion of asymptomatic infectious population at time \(t\)

\({I}_{s}(t)\)

Proportion of symptomatic infectious population at time \(t\)

\(R(t)\)

Proportion of removed population at time \(t\)

Parameter

Description

Baseline

Range

\({R}_{e}\)

Basic reproduction number

\(2.0\)

\(1.5\,{\mbox{to}}\,5.0\)

\(b\)

Transmission rate (\({{\mbox{day}}}^{-1}\))

Theoretically derived^*

Theoretically derived

\(p\)

Asymptomatic ratio

\(0.7\)

\(0.2\,{\mbox{to}}\,0.9\)

\(1/{\epsilon }_{a}\)

Mean latent period for asymptomatic infected individuals, modeled as a gamma distribution (day)

\({2.7}^{\& }\)

–

\(1/{\epsilon }_{s}\)

Mean latent period for symptomatic infected individuals, modeled as a gamma distribution (day)

\({3.2}^{\& }\)

–

\(1/{\sigma }_{a}\)

Mean infectious period for asymptomatic infected individuals, modeled as a gamma distribution (day)

\({6.0}^{\& }\)

–

\(1/{\sigma }_{s}\)

Mean infectious period for symptomatic infected individuals, modeled as a gamma distribution (day)

\({7.4}^{\& }\)

–