P.S. If you are interested we actually wrote up a case report a few years ago of what may have been Gianotti-Crosti syndrome in a mid-16th century Italian Child mummy! The mummy had evidence of a papuluar skin rash that they had thought was smallpox. We were unable to detect small pox virus (Variola virus) in the mummy but detected lots of hepatitis B virus and the rash was also consistent with Gianotti-Crosti syndrome. ( Patterson Ross, Z., J. Klunk, G. Fornaciari, V. Giuffra, S. Duchene, A. T. Duggan, D. Poinar, M. W. Douglas, J. S. Eden, E. C. Holmes and H. N. Poinar (2018). “The paradox of HBV evolution as revealed from a 16th century mummy.” PLoS Pathog 14 (1): e1006750.)