I don&#x27;t think the worry is that we will suffer a Black Plague again, but more than almost every instance of surgery or anything that leaves a person immunocompromised will lead directly to infection.<p>A lot of modern medicine suddenly becomes useless because the health benefits that it brings are nullified by the fact that an infection is sure to follow.<p>Organ transplants and chemotherapy are two big ones that become near impossible if antibiotics are useless.