According to a media release by AstraZeneca on April 28, 2022,

WILMINGTON, Del., April 28, 2022 – ULTOMIRIS® (ravulizumab-cwvz) has been approved in the US for the treatment of adult patients with generalized myasthenia gravis (gMG) who are anti-acetylcholine receptor (AChR) antibody-positive, which represents 80% of people living with the disease.

Here is a link to the media release for more information Click HERE for Link