1. Department of Microbiology, Colorado State University, Ft. Collins, Colorado1;
2. Department of Veterinary Science and Microbiology, University of Arizona, Tucson, Arizona2;
3. Department of International Health, Johns Hopkins University, Baltimore, Maryland3; and
4. Departamento de Patologia, Universidad Peruana Cayetano Heredia,4 and
5. Asociacion Benefica PRISMA,5 Lima, Peru