1. Animal Diagnostic Laboratory, Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, Pennsylvania, USA
2. Department of Biology, Pennsylvania State University, University Park, Pennsylvania, USA
3. Department of Pathology, Madras Veterinary College, Chennai, India
4. Pennsylvania Veterinary Laboratory, Harrisburg, Pennsylvania, USA
5. Center for Infectious Disease Dynamics, Pennsylvania State University, University Park, Pennsylvania, USA