How common is an underlying genetic porphyria in the MS patient community?

It's been noted that cpn takes hold because it can exploit a genetic predisposition. Cpn loves iron, and hijacks iron metabolism in the host to feed and thrive...causing acquired porphyria. I imagine that if the host had genetic porphyria, it may be easier for CPn to feed and thrive. I also imagine controlling ones free-iron content could be helpful when treating infection. 

With the ever-decreasing price of genetic sequencing, more and more people are determining their genetic profile. Wonder how many people with MS have an underlying genetic porphyria too?