1. Epidemic theory: Studying the effective and basic reproduction numbers, epidemic thresholds and techniques for the analysis of infectious diseases with particular emphasis on tuberculosis 2. Numerical methods applied to a class of SEIR epidemic models described by the Caputo derivative 23 3. Mathematical model and interpretation of crowding effects on SARS-CoV-2 using Atangana-Baleanu fractional operator 4. Analysis for modified fractional epidemiological model for computer viruses 5. Analysis of e-cigarette smoking model by a novel technique 6. Stability analysis of an unhealthy diet model with the effect of antiangiogenesis treatment 7. Analysis of the spread of infectious diseases with the effects of consciousness programs by media using three fractional operators 8. Modeling and analysis of computer virus fractional order model 9. Stochastic analysis and disease transmission 10. Analysis of the Adomian decomposition method to estimate the COVID-19 pandemic 11. Study of a COVID-19 mathematical model