There are patients with MG symptoms that are "seronegative".
Example on PubMed:
Seronegative myasthenia gravis: disease severity and prognosis. - PubMed - NCBI
If you type in "seronegative" into the MG forum first page search, you will find many people who are asking questions about this.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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