  Coronavirus disease 2019 (CoViD-19) is an infectious disease caused by severe
acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Among many symptoms,
cough, fever and tiredness are the most common. People over 60 years old and
with associated comorbidities are most likely to develop a worsening health
condition. This paper proposes a non-integer order model to describe the
dynamics of CoViD-19 in a standard population. The model incorporates the
reinfection rate in the individuals recovered from the disease. Numerical
simulations are performed for different values of the order of the fractional
derivative and of reinfection rate. The results are discussed from a biological
point of view.
