This paper studies the endemic behavior of a multi-competitive networked susceptible-infected-susceptible (SIS) model. In particular, we focus on the case where there are three competing viruses (i.e., the tri-virus system). First, we show that the tri-virus system is not a monotone system. Thereafter, we provide a condition that guarantees local exponential convergence to a boundary equilibrium (exactly one virus is endemic, the other two are dead), and identify a special case that admits the existence and local exponential attractivity of a line of coexistence equilibria (at least two viruses are active). Finally, we identify a particular case (subsumed by the aforementioned special case) such that, for all nonzero initial infection levels, the dynamics of the tri-virus system converge to a plane of coexistence equilibria.
@article{arxiv.2209.11826,
title = {On the Endemic Behavior of a Competitive Tri-Virus SIS Networked Model},
author = {Sebin Gracy and Mengbin Ye and Brian DO Anderson and Cesar A. Uribe},
journal= {arXiv preprint arXiv:2209.11826},
year = {2024}
}