Acknowledgements
We would like to thank Dr G. Borzacchiello, Department of Veterinary Medicine and Animal Productions, Naples University, and Dr A. Venuti, IRCSS Regina Elena National Cancer Institute, Rome, for providing BPV-1- and BPV-2-positive samples as a kind gift; Dr G. Salvatore, Regione Basilicata, Drs E. Grieco and S. Milone from Azienda Sanitaria Locale (ASL) of Salerno, Dr R.N. La Rizza from ASL of Vibo Valentia, Dr. Domenico Rufrano, scholarship holder of Naples University, Dr S. Morace, University of Catanzaro “Magna Graecia” for their technical help.