1. Centers for Disease Control and Prevention, Division of Vector-Borne DiseasesRickettsial Zoonoses Branch Atlanta GA USA
2. Department of Biomedical Sciences, Ohio University, Heritage College of Osteopathic MedicineInfectious and Tropical Disease Institute Athens OH USA
3. Pontificia Universidad Católica del Ecuador, Centro de Investigación para la Salud en América LatinaEscuela de Ciencias Biológicas Quito Ecuador
4. Organization for Tropical Studies-North American BranchTropical Diseases, Environmental Change and Human Health Program Durham NC USA
5. School of Medicine, Department of Microbiology and ImmunologyUniversity of Colorado Denver CO USA
6. Centers for Disease Control and Prevention, Division of FoodborneWaterborne, and Environmental Diseases, Enteric Disease Laboratory Branch Atlanta GA USA