In italy we have to thank
swine flu because it stopped the other aggressive
flu viruses so we had no
flu season here (you cannot be infected by two flu viruses at the same time so weak flu viruses or adenoviruses that make mild cold block entrance to other viruses)
US drug makers made this up because of the losses due to the economic crises, if you make vitamin D level, which is an homrone not vitamin, between 50 and 60ng/ml by sun exposure or vitamin d3 supplements you will avoid swine flue or