1. Alexander von Humboldt Tropical Medicine Institute, Department of Medicine, Universidad Peruana Cayetano Heredia, Cusco Branch, Peru;
2. Infectious Diseases Division, Department of Internal Medicine, University of Texas Medical Branch, Galveston, Texas;
3. Zoonosis Unit, Direccion Regional de Salud del Cusco, Ministerio de Salud, Cusco, Peru
4. School of Medicine, University of Texas Medical Branch, Galveston, Texas;