I actually had never heard of this until this post. While I can understand why it concerns you, I too would hope that you can "lay it aside" and not worry over it - the stress surely won't help a thing.
I did find this pretty quickly about
MGUS though:
"As far as the transient MGUS is concerned it has been associated with various disorders. There have been reported mainly autoimmune diseases (i.e., SLE, autoimmune hepatitis, rheumatoid arthritis), drugs, and toxins.
Moreover, chronic infections like HBV and HCV, HIV, CMV, HSV, Brucella, rickettsioses, and Bartonella species have been illustrated as etiological agents. Although there is no established pathogenesis, it is assumed that patients suffered from diseases stimulating increased production of immunoglobulins over a long period may present a monoclonal gammopathy. "
/www.hindawi.com/journals/crim/2012/607104/ Seems that there are several vector-borne infections that can cause this type of issue - and that's not the only issues that can be caused in the bone marrow. We are seeing more and more people finding abnormal results on things that have to do with bone marrow production of different things.