Uncertainty surrounds flu vaccines for elderly

The New York Times reports that flu vaccines may not have any effect for senior citizens over the age of 70.

"A growing number of immunologists and epidemiologists say the vaccine probably does not work very well for people over 70, the group that accounts for three-fourths of all flu deaths."

However, in spite of the uncertainty, the Centers for Disease Control and Prevention still recommends flu shots to at-risk populations.