We have type A, type B, and a new type. I do not know which one I got last week. My badminton mates were discussing (while practicing..) about how to prevent the flu.
It is commonly known that people over 60 do not get the flu because they are immune to the flue today, but according to a teammate, people who used to drink "Dassi Funnyu" also have less risk to catch the flu. "Dasshi Funnyu" can be literally translated as skim milk or fat-free milk, but in fact it is something that tastes much worse than those. Dasshi Funnyu, skim milk, were brought to Japan after WWII by U.S. Government as a part of aid supply and they were provided to children as school lunch. We should appreciate the kindness of Americans, but... it seems that they did not care about its taste as much as its nutrition value..... So Dasshi Fyunnyu is regarded as synonym for slop food (sorry!) in old days. Anyway, it is considered that Dasshi Fyunnyu was supplied at Japanese schools mainly in 50's and 60's. Again, thanks to American, now it is said, whether it is just a rumor, Japanese who took the food in childhood may have less risk to catch the flu!
However, the best way is to prevent the flu is still washing hands and gargle throat.
* But you may want to try (^_^) since it worked!