Quantitative Analysis of COVID-19 Pandemic Responses Based on an Improved SEIR-SD Model

Table 1

Definition of parameters in Figure 1.

Parameter	Definition
IR	The proportion of close contacts infected
QR	The proportion of close contacts found and quarantined (quarantine rate)
ND	The number of uninfected cases in close contact but not quarantined daily
YD	The number of infected cases in close contact but not quarantined daily
CN	The average number of close contacts of infected cases
CD	The number of close contacts of those with symptoms daily
AN	The number of people except for those in quarantine, hospitalization, and death
CC	The cumulative number of close contacts
EC	The cumulative number of infected cases in the incubation period
ED	The number of infected cases going into incubation period daily
NN	The average number of daily contacts per person (average contact number)
PN	Cumulative population
ER	The proportion of infections after contacting infected cases (contact infection rate)
SC	Susceptible population
IN	The number of initial infected cases