What is the autoimmune issue with Covid19?

The definition from Science Daily:

A cytokine storm is an overproduction of immune cells and their activating compounds (cytokines), which, in a flu infection, is often associated with a surge of activated immune cells into the lungs.

Causes the inflammatory response to go out of control.

Here's some more info:
https://www.breakthroughs.com/foundations-science/inside-cytokine-storm-when-your-immune-system-too-strong

a thread. It is what killed so many people that should have remained healthy (people in their 20s and 30s) during the 1918 Spanish Flu.

1918 flu- one born spring 1919 and the next summer 1920. I just realized this and appreciate how healthy they both were, esp. my grandmother who was about age 24.

in Phila. It was the hardest hit city and I had tons of relatives there.

have been quite strong too. Lucky people.

I know of only one relative who died young, a sister and wife around age 29 that caught pneumonia in the 1930s or early 1940s before penicillin was available. And to think how much more medical knowledge and resources we have now.

luck and strong genes continue.

The virus multiplies quickly. If your initial infection is large, like someone coughing in your face, it multiplies so quickly your system is overwhelmed. If it starts out very small it takes a little longer and your body has more time to adapt. At least that’s the theory.

Good lord, this keeps getting debunked on here, then someone else posts it again. The 1918 Flu did that, this is not doing that.