Vaccine-preventable diseases cost the U.S. $9 billion in 2015, mostly because unvaccinated people got sick. It’s flu season—and not getting your shot could prove costly. Last year, influenza dinged the U.S. economy for...
When microbiologist Maurice Hilleman was testing his revolutionary mumps vaccine in the 1960s, parents allowed their children to participate in the clinical trial in a simple way: They signed their names on an index...