Myasthenia Gravis Support Group
Myasthenia gravis (MG) is a neuromuscular disease leading to fluctuating muscle weakness and fatiguability. The hallmark of myasthenia gravis is muscle weakness that increases during periods of activity and improves after periods of rest. Although myasthenia gravis may affect any voluntary muscle, muscles that control eye and eyelid movement, facial expression, and...

https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/agent-orange
Apart from that why do you ask? Perhaps one could add that as far as I know Vietnam doesn't seem to have a higher incidence of MG than any other country.
http://www.militarydisabilitymadeeasy.com/centralnervoussystem.html#i
Code: 8025.
There seems to be a lot is discussion about whether MG is linked to Agent Orange or not but find it interesting that it is on the Presumptive list.
"What is “Presumptive” Service Connection? VA presumes that certain disabilities were caused by military service. This is because of the unique circumstances of a specific Veteran's military service. If a presumed condition is diagnosed in a Veteran in a certain group, they can be awarded disability compensation."
We will be filing for VA Disability Benefits next week in an attempt to link this disease with my service there.
Peter