anyone into epidemiology or maths of disease modeling?

I was wondering if there was a point where covid would be uncontrollable regardless of measures. Like a runaway point.
I think in nuclear physics there's a point (critical mass) where the reaction is self-sustaining (which we're past with covid). Then there's a point (supercritical?) where it's uncontrollable (and leads to a nuclear explosion). Is there such a point in epidemiological modeling?