This year's flu shot may not be an exact match for circulating strains, but public health experts say to get vaccinated anyway.
A strain of the influenza virus that’s not a precise match for the vaccine has been spreading in the U.K., Canada and Japan, among other countries, and could sicken many in the U.S. this flu season.
“The flu is on our doorstep, and soon it will be kn... [2593 chars]