“…The studies with negative PCR results were more rigorous in that they investigated larger numbers of patients and applied more than one primer set. In other reports the association has been alleged based on diagnostic methods that are far less specific such as immunohistology, focus-floating microscopy, silver staining, or lymphoproliferative response assays (Buechner et al, 1995;Eisendle et al, 2007). In case reports, B. burgdorferi infection has been implicated in the causation of two additional sclerosing disorders, progressive facial hemiatrophy and eosinophilic fasciitis (Shulman syndrome), based on silver staining, immunohistology, or PCR (Stern et al, 1992;Granter et al, 1994).…”