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Autoimmune disorders cause the immune system to not recognize anything. They can't tell friend from foe, and default to attacking everything.
Measles causing immune system amnesia by attacking and killing where the immune system stores memories.
The immune system still attacks everything, it just doesn't remember what works on every virus.
So it will still attack friendly parts of your body, because it's "targeting system" still just tells it to blast everything that moves.
And because it doesn't remember how to fight actual threats, it generated a larger and less effective immune response, then all those immune cells attack random stuff, which leads to measles making any autoimmune issue even worse.
That's not quite right - autoimmune disorders don't attack "everything" indiscriminately, they target specific self-antigens (like myelin in MS or joint tissue in RA) while still functioning normally against most pathogens.
So that person expanded their response with more details and you have an issue with that?
Not sure where you read that.
If that were the case lemtrada and the like would have 100% relapse rates and wouldn't be fda approved.
Why?
https://my.clevelandclinic.org/departments/neurological/depts/multiple-sclerosis/ms-approaches/lemtrada-alemtuzumab
That's the mechanism of action, and I'm not sure what connection you're drawing.
Lemtrada is straight up blowing up the immune system and destroying individual cells