Optimal nutritional status for a well – functioning Immune system is an important factor to protect against viral infections : https://www.mdpi.com/2072-6643/12/4/1181
Age:
Corona virus pandemic our world in data: https://ourworldindata.org/coronavirus
https://www.researchgate.net/publication/38074440_Senescence_of_the_Human_Immune_System
Obesity:
Specific micronutrients and immunity:
Chloroquine & Zinc:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4182877/