Epidemic model (1927) In its initial form, Kermack–McKendrick theory is a compartmental differential-equation model that structures the infectioned population in terms of age-of-infection, while using simple compartments for people who are susceptible (S)  and recovered/removed (R). Specified initial conditions would change over time according to  Only in the special case when the removal rate and the transmission rate are constant for all ages does the substitution transform their theory into the simple SIR model. This basic model only accounts for infection and removal events, which are sufficient to describe a simple epidemic, including the threshold condition necessary for an epidemic to start, but can not explain endemic disease transmission or recurring epidemics.
Epidemic model (1927) In its initial form, Kermack–McKendrick theory is a partial differential-equation model that structures the infected population in terms of age-of-infection, while using simple compartments for people who are susceptible (S) , infected (I), and recovered/removed (R). Specified initial conditions would change over time according to This formulation is equivalent to defining the incidence of infection . Only in the special case when the removal rate and the transmission rate are constant for all ages can the epidemic dynamics be expressed in terms of the prevalence , leading to the standard compartmental SIR model. This model only accounts for infection and removal events, which are sufficient to describe a simple epidemic, including the threshold condition necessary for an epidemic to start, but can not explain endemic disease transmission or recurring epidemics.
R
compartmental
partial
R
infectioned
infected
A
, infected (I),
A
This formulation is equivalent to defining the incidence of infection .
R
does the substitution transform their theory into the simple
can the epidemic dynamics be expressed in terms of the prevalence , leading to the standard compartmental
D
basic