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Table 1 All variables in system (1)–(8) and their definitions

From: Nonstandard theta Milstein method for solving stochastic multi-strain tuberculosis model

VariableDefinition
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.