Countering a U.S. government advisory, a new study suggests that adults may not need regular booster shots for tetanus and diphtheria if they received a complete vaccination series as children.

Researchers compared data gathered from millions of people in 31 countries in North America and Europe between 2001 and 2016. They found no significant differences in rates of the two diseases...

Preemies often lag behind full-term babies in getting routine vaccinations -- and the difference remains at age 3, a new study finds.

Misguided parental "hesitancy" over the safety of vaccines for preemies might be to blame, researchers said.

The study found that preterm babies were less likely to be up-to-date on seven recommended vaccines by 19 months of age. More than hal...