Childhood vaccine rates for preventable diseases like measles and whooping cough have fallen during the COVID-19 pandemic, raising the possibility of an additional health crisis. In New York City, Mayor Bill de Blasio (D) on Wednesday said the number of vaccine doses administered from March 23 to May 9 fell 63 percent compared with the same period last year. In children older than 2 years, it fell 91 percent, de Blasio said. "The reasons are obvious. Doctors offices have been closed, families are staying home, it makes sense that even parents, grandparents, guardians, others, might not have known where to...