 [ Symptoms ] why would a dr do a doppler on the neck for poor leg circulation  my wife went to the dr for sore legs and they determined she had some type of blockage and sent her to north central heart institute to a heart specialist and he had a doppler ultrasound done on her neck why would he do that for poor leg circulation [ Disease ] most experts believe that flu viruses spread mainly by droplets made when people with flu cough sneeze or talk these droplets can land in the mouths or noses of people who are nearby less often a person might also get flu by touching a surface or object that has flu virus on it and then touching their own mouth eyes or possibly their nose