Check out the article on the main site (pregnancy section). Do you know that every year, they guess pick 3 strains of the hundreds circulating to see what to put in the vaccine, before the flu season even starts? And a huge study found vitamin d3 to be more effective against flu than the flu vaccine? Its very hit and miss and so much you need to know before you put guesswork into bodies. Oh, and studies show health care professionals have a pretty low vaccination rate. Article will tell you why.