Healthy young adults below age 50 survive Covid-19 better than influenza virus, but 1 in 3 young adults have a pre-existing condition that could make Covid-19 fatal or permanently injurious.
It seems to me that a young adult could have no pre-existing conditions mentioned in the article, but if their immune system is circulating an above average amount of the allergy related Cytokine named IL-13 mentioned in a previous post they could die from a “Cytokine Storm” over-reaction.