Some of the people hit hardest by the coronavirus are older folks and people with pre-existing health conditions, like high blood pressure, diabetes, and obesity. The potentially deadly virus seems to spare the relatively young and the generally healthy. But not all of them.
What makes one healthy young person contract the coronavirus and fight for her life on a ventilator while another gets through the infection almost symptom-free? For that matter, what makes anyone go to the hospital with COVID-19 when not everyone does? And what about people who don't catch it all? Why might all the guests at a wedding, for example, pick up the bug except for one?
The answers could be written in your genes. Researchers around the world are trying to find out which ones.