How to improve your own immune system to avoid affect by H7N9

Many Nu Skin products were sold out during the SARS hit 10 years ago. The most popular products were: reishimax, Teagreen 97, Lifepak, G3 & antiseptic hand sanitizer. So if you want to improve your immune system to avoid any affection by the H7N9 or whatever bird flu viruses maybe, get the products asap before it's too late.