  Severe Acute Respiratory Syndrome-CoronaVirus 2 (SARS-CoV2) caused the
ongoing pandemic. This pandemic devastated the world by killing more than a
million people, as of October 2020. It is imperative to understand the
transmission dynamics of SARS-CoV2 so that novel and interdisciplinary
prevention, diagnostic, and therapeutic techniques could be developed. In this
work, we model and analyze the transmission of SARS-CoV2 through the human
respiratory tract from a molecular communication perspective. We consider that
virus diffusion occurs in the mucus layer so that the shape of the tract does
not have a significant effect on the transmission. Hence, this model reduces
the inherent complexity of the human respiratory system. We further provide the
impulse response of SARS-CoV2-ACE2 receptor binding event to determine the
proportion of the virus population reaching different regions of the
respiratory tract. Our findings confirm the results in the experimental
literature on higher mucus flow rate causing virus migration to the lower
respiratory tract. These results are especially important to understand the
effect of SARS-CoV2 on the different human populations at different ages who
have different mucus flow rates and ACE2 receptor concentrations in the
different regions of the respiratory tract.
