Influenza is the seventh leading cause of death in children under the age of 14 in the United States. Illness can be life-threatening and needs to be taken seriously. A flu vaccine is developed each year to keep up with the ever changing strains that are circulating. This year 2015-2016, the strains circulating match the vaccine accurately. Last year 2014-2015, the vaccine was less than 50% preventative. I hope you find this information helpful.