“…In contrast to the low copy numbers of MCPyV detected by van Boheemen et al 4 in their FSMM case, TSPyV is found at an average of about 10 6 copies/cell in cases of TS 3 . Moreover, while ultrastructural analyses in cases of FSMM have consistently failed to identify viral particles in affected tissue, the overwhelming majority of cases of TS in which electron microscopy has been attempted do show evidence of viral particles 2 .…”