Any volunteers to have doctors intentionally give you blood poisoning, then take experimental drugs to cure it? Keep in mind that a quarter of those TREATED for sepsis will die, and naturally you wouldn't be able to take other treatments or that would cloud the results. So you'll die of sepsis, unless the drugs they're testing kills you first.
Anyone volunteering, you've clearly got some problems and would be unsuitable to study anyway. And forcing people to participate in the research and letting them die has its own problems.
Researchers already knew that mice models were far from perfect. Anyone paying any attention to biomedical research knows that if some amazing cure is demonstrated in mice, it will likely never be heard of again since it didn't pan out. It's important to realize if one hadn't already that mice weren't perfect models for humans, but it's also important to realize that drug testing in mice IS necessary.