Dr. Michael Carter, MD and functional medicine practitioner explains what a virus is, what is unique about SARS-CoV-2, the virus that causes the disease COVID-19. He also explains how to tell if you have the cold, flu, or COVID-19 and he explains a surprising meaning of immunocompromised. Paragraph Dr. Carter is a board-certified physician. Over the past 10 years, Dr. Carter has expanded his education into functional or root-cause medicine, initially driven by a personal struggle with glaucoma. He has obtained an impressive amount of continuing educational certifications in topics including: stem cells, energy medicine, nutrition, advanced peptides, cancer treatment, and solutions to Alzheimer’s disease. Dr. Carter runs a successful virtual health center where he offers a deep diagnostic dive into the root-cause of complex and often ill-defined health conditions. His research had led to non-pharmaceutical interventions and protocols the provide his patients with lasting and sustainable resolution from their pre-existing chronic health maladies. Dr. Carter is co-inventor of the 4-Dimensions of Health program that identifies risk and causes of disease at the root-cause and maps the information to a personalized and precision care plan that very often completely reverses (cures) and individual’s disease.