I am seronegative and don't fit that category. I have had Mg symptoms that started at the age of 10 (1972) didn't get a Dx until Oct. 2020. Many mis dx and no treatments. From my understanding when MG starts that early someone can go into remissions more often without treatment, more like RRMS rather than MG. Back in 2005-7 I was bad enough the Dr.'s were looking to place me in a nursing home for the rest of my life along with informing me that they didn't know what kind of neurological condition I had to make final arrangement as there was nothing they could do if my breathing got worse! Then from 2010-end of 2019 only minor issues. Then full flare again Jan 2020, given Mestinon Oct.2020. with possible MG. Jan.2021 with a Dx of "Mild" seronegative MG. After being transported by ambulance at my neurologist request... for emergency IVIG (that was refused because of the "Mild" they placed on me at the university. With a single breath count of 3 NIF of 13 at the time. Time of release the next day single breath count of 13 NIF Of 13 told I was fine and all functional because I am seronegative, and it is always mild and would not cause this type of Issues. When Mine gets bad It's bad for a few years. (Not just a few days that what I call more of my remission.) With the whole 9 yards of symptoms. Breathing, chewing Swallowing, fatigue, etc... Hope this helps answer your question. Best Of Wishes to you!! ❄Sally Farrier...Myasthenia-Gravis.com (Team Member).