Table 1 All variables in system (1)–(8) and their definitions
From: Nonstandard theta Milstein method for solving stochastic multi-strain tuberculosis model
Variable | Definition |
|---|---|
S(t) | The susceptible population (individuals who have never encountered TB) |
Ls(t) | The individuals infected with the drug-sensitive TB strain but who are |
in a latent stage, i.e., who are neither showing symptoms nor infecting others | |
Lm(t) | Individuals latently infected with MDR-TB |
Lx(t) | Individuals latently infected with XDR-TB |
Is(t) | Individuals infected with the drug-sensitive TB strain who are infectious |
to others (and most likely showing symptoms as well) | |
Im(t) | Individuals who are infectious with the MDR-TB strain |
Ix(t) | Individuals who are infectious with the XDR-TB strain |
R(t) | Individuals for whom treatment was successful |
N(t) | The total population, |
N=S+Ls+Lm+Lx+Is+Im+Ix+R. |