1. Infectious Diseases Division, Department of Internal Medicine, University of Texas Medical Branch, Galveston, Texas.
2. Universidad Peruana Cayetano Heredia–University of Texas Medical Branch Collaborative Research Center—Cusco, Cusco, Peru.
3. School of Public Health, Universidad Peruana Cayetano Heredia, Lima, Peru.
4. Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia, Lima, Peru.
5. Departamento de Microbiologia, Universidad Peruana Cayetano Heredia, Lima, Peru.