The government are already talking about using trainee doctors for the critical period. In addition there is another huge resource which is easily available and that is the large army of vets.
Vets are trained to work on any animal species, and the only thing stopping them treating humans is the law. And if I were faced with no doctor or a vet, I would pick the vet any day (indeed it’s arguable they are better than doctors as they have far wider experience and can be more innovative with treatments).