The quality and quantity of the science being used to buttress public health policy and law in the 21 st century, particularly vaccine policy and law, has been debated since the mid-20th century when serious adverse reactions to whole-cell pertussis (DPT) vaccine were acknowledged in the medical literature and publicized in Europe and the U.S. This 2020 conference, like the four previous public conferences on vaccination sponsored by NVIC between 1997 and 2009, features presentations by scientists, physicians, and health professionals examining vaccine science policy, law, and ethics. Multidisciplinary Approach.