Is myocarditis at ME/CFS onset common? One might expect this to be fairly common if this theory is correct.
I am not aware of myocarditis (heart muscle infection) being more common in ME/CFS patients.
However, I don't think Professor Peter Behan was proposing that coxsackievirus B (CVB) myocarditis and the ANT autoantibodies it generates are the cause of ME/CFS.
Rather it is the CVB
skeletal muscle infections (which
numerous studies have found in ME/CFS patients) which he proposed might be generating ANT autoantibodies (or some similar autoantibody), and these ANT autoantibodies would then block the energy metabolism in those
skeletal muscles, leading to the well-known ME/CFS symptoms of: lack of strength or energy in the muscles, rapid muscular fatigability, and PEM after physical exercise using the muscles.
(Skeletal muscles are the ones you use for any physical movement of the body).
So we are not saying CVB myocarditis is causing ME/CFS; rather we are just using CVB heart muscle infection as a model for understanding the CVB skeletal muscle infections in ME/CFS.
We know from the German research that CVB heart muscle infections generate ANT autoantibodies which have been shown to target the mitochondria of the heart muscle, and thereby impair mitochondrial energy production in this muscle.
In fact, in the guinea pig study detailed in the first post of this thread, the energy output of hearts affected by the ANT autoantibody was
five times less than the energy output of the hearts of healthy animals. So the ANT autoantibody causes a major blockage of energy production in the heart muscle.
Thus the question then arises: if CVB infection of the
heart muscle can generate ANT autoantibodies which block heart muscle energy production, can the same ANT autoantibodies appear in CVB infections of the
skeletal muscle, causing similar energy production blockages in those skeletal muscles? If so, this could explain some of the primary ME/CFS symptoms.