  We consider weak solutions to $$-\Delta_pu+a(x,u)|\nabla u|^q=f(x,u),$$ with
$p>1$, $q\geq\max\,\{p-1,1\}$. We exploit the Moser iteration technique to
prove a Harnack comparison inequality for $C^1$ weak solutions. As a
consequence we deduce a strong comparison principle.
