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Fig. 2 | BMC Infectious Diseases

Fig. 2

From: Estimating asymptomatic, undetected and total cases for the COVID-19 outbreak in Wuhan: a mathematical modeling study

Fig. 2

Transmission and detection dynamics of COVID-19 in Wuhan. Compartments in blank background describe the transmission dynamics while compartments in mint background refer to the case detection and reporting dynamics. The population is stratified into seven compartments: susceptible (S(t)), exposed (E(t)), infectious but asymptomatic (A(t)), infectious, symptomatic, and detectable (I1(t)), infectious, symptomatic, but undetectable (I2(t)), effectively isolated (H(t)), recovered or removed due to death (R(t)) at time t. For the dynamics of case identification and reporting, D(t) is the number of cases that are detectable but not yet detected or reported and W(t) is the number of cases that have been reported at time t. Phase I represents the period before Jan 23 (the day of lockdown) and Phase II refers to the period after Jan 23

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