Karen,
I appreciate your research on prevention of flu, but you forgot the biggest prevention that there is - handwashing.  It is so important that you wash your hands and keep your hands away from your face.  In order to get a germ into the body, there has to be a portal of entry.  Our portals of entry consist of our eyes, ears, nose, mouth, vagina and rectum.  I would venture to guess that most people who are getting the flu touched something that harbored the bacteria for flu and then either touched food that they injested, put their fingers in the mouth or put their fingers in their nose.  I am always trying to keep my grandbabies hands clean.  The other day while we were waiting to be seated at Steak and Shake, they were touching the bar stools, touching the table tops around the bar, touching the machine that grabs stuffed animals and touching a gum machine.  Then we sat down to eat.  It is so important that you wash your hands and your children's hands before eating every meal and every snack.  Try to encourage them not to pick their nose by telling them that it introduces germs into their bodies that can make them sick.  It is more important that the hands are washed BEFORE the meal than after the meal.  How many times do you see people sit down to eat without washing their hands, but then they get up from a meal and wash their hands to remove the messy food from their fingers/hands?  Also when in a public restroom, you should wash your hands before leaving and then use either a paper towel or some toilet paper to open the door of the restroom upon exiting.  Many people never wash their hands upon exiting a restroom and they open the doors with their dirty hands.  If you wash your hands, but then use those clean hands to open a door, it is as though you never washed your hands.  More and more businesses are locating trash cans next to the exit door so that people can dispose of the paper towel that they open the door with.
 
If you keep dirty hands away from your face, fingers out of your nose, and hands clean before eating anything at all (even think about snacks) you have a good chance of not contracting the flu or many other infections.  The only other way that you could contract the flu would be through eating contaminated food at a restaurant.  It might be a good idea to cook at home until this flu outbreak is over.
 
God bless and stay healthy,
Kim D.