Some simple, practical steps can raise your resistance to viruses. As always, consult with a medical professional before making significant lifestyle changes

How to Boost Your Immunity
For people who hope to build up their resistance to coronavirus and infections of all kinds, there are no magic formulas—but there are some science-based steps one can take to maintain a healthy immune system.
https://www.scientificamerican.com/article/how-to-boost-your-immunity/
https://www.scientificamerican.com/article/how-to-boost-your-immunity/