Flu shot scientists hope for a higher rate of success than last season, whose vaccine had a 13 percent effectiveness against the predominant strain.
Flu shot scientists hope for a higher rate of success than last season, whose vaccine had a 13 percent effectiveness against the predominant strain. Handout Fotolia
Flu shot scientists hope for a higher rate of success than last season, whose vaccine had a 13 percent effectiveness against the predominant strain. Handout Fotolia