Table 1 Description of model’s parameters.

From: Theoretical and mathematical codynamics of nonlinear tuberculosis and COVID-19 model pertaining to fractional calculus and probabilistic approach

Symbols

Description

\(\beta \)

People’ spontaneous mortality rate

\(\rho \)

Rate of transmission of COVID-19 andTB exposure within the contaminated group

\(\varphi _{1}\)

Transmission rate of infection among those inoculated to COVID-19

\(\varphi _{3}\)

Probability of recuperation for a COVID-19 influenced person

\(\epsilon \)

Percentage of TB exposure in people subjected to COVID-19

\(\varpi \)

Recuperation percentage of inactive TB infections

\(\nu \)

Percentage of COVID-19 afflicted people who have TB disease

\(\varsigma _{3}\)

COVID-19 contamination incidence among TB patients

\(\varphi _{2}\)

Probability of recuperation for those subjected to COVID-19

\(\eta \)

Probability at which people exit the \({{\textbf{L}}}_{{\textbf{T}}{\textbf{C}}}\) group

\(\varsigma _{1}\)

TB healing rate for \({{\textbf{L}}}_{{\textbf{T}}{\textbf{C}}}\) of long-term care residents

\(\varsigma _{2}\)

Percentage of \({{\textbf{L}}}_{{\textbf{T}}{\textbf{C}}}\) patients recuperating with COVID-19

\(\xi \)

Proportion at which people quit the affected group \({{\textbf{I}}}_{{\textbf{T}}{\textbf{C}}}\)

\(\theta _{1}\)

\({{\textbf{I}}}_{{\textbf{T}}{\textbf{C}}}\) patients’ rate of TB recurrence

\(\theta _{2}\)

COVID-19 recuperation percentage among \({{\textbf{I}}}_{{\textbf{T}}{\textbf{C}}}\) participants

\(\lambda \)

Percentage of people suffering from TB who also get COVID-19

\(\delta \)

Recoverability percentage of TB patients

\(\zeta _{{\textbf{T}}}\)

Mortality rate from TB

\(\zeta _{{\textbf{C}}}\)

Mortality rate from COVID-19 infection

\(\zeta _{{\textbf{T}}{\textbf{C}}}\)

Mortality incidence as a result of both infections co-occurring

\(\nabla \)

Recruiting rate for those who are vulnerable

\(\alpha _{1}\)

Prevalence of TB infection propagation

\(\alpha _{2}\)

Rate of COVID-19 propagation

\(\mu \)

Percentage of people confronted with TB who get the disease

\(\psi _{{\textbf{T}}}\)

Intensity transmission for TB (the likelihood of contracting a  virus  from  a TB sick person)

\(\psi _{{\textbf{C}}}\)

COVID-19 intensity of illness: the  likelihood  of  contracting  the virus from a person who has COVID-19 illness