1. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Texas Department of Health, Harlingen, Texas, USA
3. Cameron County Health Department, San Benito, Texas, USA
4. Natural History Museum, University of Kansas, Lawrence, Kansas, USA
5. Centro de Investigaciones sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública Cuernavaca, Morelos, México