Drop in adult flu vaccinations may be a factor in last season's record-breaking deaths, illnesses

Fewer than 4 out of 10 adults in the United States got flu shots last winter, the lowest rate in seven seasons and one likely reason why the 2017-2018 season was the deadliest in decades. Reports released Thursday by the Centers for Disease Control and Prevention provide new details outlining the severity of the past flu season during which more people were killed than any seasonal influenza since the 1970s.