Stability Analysis of DFE in terms of R0 Using Ruth-Hurwitz Criterion

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I am working with an epidemiological model in the form of a dynamical system of seven ODEs and I am trying to show that the DFE is stable if R0<1. When applying the Routh-Hurwitz criterion, I see that one of the coefficients of the characteristic polynomial cannot be rewritten in terms of R0 (so that the coefficient is positive when R0<1). I tried to manipulate this coefficient in several ways, but end up getting another condition for that coefficient to be positive apart from R0<1. So, I just wanted to know if this is allowed or if I am doing something wrong. Also, I want to confirm that I checked my computations and simplifications several times, so I am certain that I am not doing any simplification errors. Thank you for your time!