Or with the natural immunities we always had.
I couldn't agree more. Build up your immunity as much as possible; take daily a good probiotic (Renew Life or Garden of Life) multi-vitamin with zinc, and herbals (ginger, peppermint, turmeric). Have Elderberry on hand should you start to feel ill.
There is also
Airborne Vitamin C and Immune Support Supplement, it contains a unique Vitamin, Mineral & Herbal blend that helps support your immune system. It is high in antioxidants (Vitamins A C E) and contains Zinc, Selenium, Manganese & Magnesium.
You can also get Airborne with Elderberry as well.