In recent decades, many germs affecting humans, such as Ebola, methicillin-resistant Staphylococcus aureus (MRSA), SARS, West Nile virus, and Zika, have spread or changed to pose a growing danger to the world. To make matters worse, measles and whooping cough, diseases once considered on the verge of elimination, have had a resurgence in part because disinformation about vaccines has made some people reluctant to vaccinate themselves or their children...