Table 1 Definitions of frequently used parameters
From: What is the role of aerosol transmission in SARS-Cov-2 Omicron spread in Shanghai?
Variables | Description |
|---|---|
\(\beta (t)\) | Transmission rate by close contact with infectious |
f | Transmission rate by aerosol |
\(\xi\) | Probability of exposure to aerosol |
\(\theta\) | Infectivity of asymptomatic cases |
| Â | relative to symptomatic cases |
\(\varphi\) | Reduction of transmission rate due to vaccination |
\(1/\sigma\) | Average duration of latent period |
d(t) | Detection rate of nucleic acid testing |
p | Proportion of an unvaccinated latent who developed symptoms |
\(\eta\) | Proportion of a vaccinated latent who developed |
| Â | symptoms relative to an unvaccinated latent |
\(1/\gamma _A\) | Average infectious periods of asymptomatic population |
a(t) | Average transfer rate from asymptomatic onset to shelter hospital |
\(\delta\) | Transfer rate from asymptomatic cases to symptomatic cases |
\(1/\gamma _I\) | Average infectious periods of symptomatic population |
| Â | hospitalizations relative to an unvaccinated infection |
b(t) | Average transfer rate from symptom onset to designated hospital |
\(1/\gamma _F\) | Length of shelter hospital stay before recovery |
\(1/\gamma _H\) | Length of hospital stay before recovery |
\(\mu\) | Fatality rate among unvaccinated hospitalized patients |
\(\omega\) | Proportion of unvaccinated hospitalized patients requiring ICU |
\(\varepsilon\) | Proportion of fatality rate among vaccinated hospitalized patients |
| Â | relative to an unvaccinated patients |
\(\kappa\) | Proportion of vaccinated hospitalized patients requiring |
| Â | ICU relative to an unvaccinated patients |
\(\pi\) | Fatality rate among ICU patients |
\(1/\gamma _c\) | Length of ICU stay before recovery death |
\(1/\gamma _{cD}\) | Average time from ICU admission to death |
\(1/\gamma _D\) | Average time from hospital admission to death |