Numerical investigations of stochastic HIV/AIDS infection model

• Main Authors: Zain Ul Abadin Zafar, Nigar Ali, Samina Younas, Sayed F. Abdelwahab, Kottakkaran Sooppy Nisar
• Format: Article
• Language: English
• Published: Elsevier 2021-12-01
• Series: Alexandria Engineering Journal
• Subjects: HIV/AIDS epidemic model; Stochastic differential equations (SDEs); Milstein scheme; Stochastic NSFD scheme (SNSFD); Stochastic Euler scheme (SES); Stochastic Runge-Kutta 4 (SRK-4) scheme
• Online Access: http://www.sciencedirect.com/science/article/pii/S1110016821002696

In this paper, a stochastic HIV/AIDS epidemic model has been studied numerically. A discussion among the solutions related to deterministic HIV/AIDS model and stochastic HIV/ AIDS epidemic model has shown that the stochastic solution is more realistic than the deterministic solution. To control the diseases, the threshold parameter R0 plays a key role in the stochastic HIV/AIDS epidemic model. If R0<1 then disease is under control while the disease is out of control if R0>1. The explicit approaches such as the Milstein scheme, stochastic Euler scheme, and stochastic Runge-Kutta 4 are dependent on temporal step size, whereas non-standard finite difference approaches are independent of step size. The results for numerical approaches like the Milstein scheme, stochastic Euler scheme, and stochastic Runge-Kutta 4 scheme fail for outsized step size. The stochastic non-standard finite difference scheme conserves dynamic features like confinedness, consistency and positivity.