1. Department of Biomedical Sciences, Division of Infectious Diseases, Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts 01536
2. Institute of Infectious Diseases and Public Health, University of Ancona, Ancona, Italy
3. Department of General Surgery, INRCA, IRRCS, University of Ancona, Ancona, Italy
4. Centegen Inc. Baltimore, Maryland 21208