CORAL GABLES, FL - JANUARY 07:  Yasunary Garrido holds her son, Samuel Espinoza, 2, as he receives a flu vaccination in the leg from pediatrician Dr. Amanda Porro M.D. during a visit to the Miami Children's Hospital on January 7, 2015 in Coral Gables, Florida. The Centers for Disease Control and Prevention  announced that in the United States the virus that causes the flu is particularly bad this year and has hit most parts of the United States, with 43 states experiencing 'widespread' flu activity and six others reporting 'regional' flu activity.  (Photo by Joe Raedle/Getty Images)