1. Division of Vector-Borne Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, 3156 Rampart Rd., Fort Collins, CO 80521 (uzj6@cdc.gov; hyb4@cdc.gov; fth3@cdc.gov; lfz2@cdc.gov; hyn8@cdc.gov; kje5@cdc.gov; xhk9@cdc.gov; vtx8@cdc.gov; nzp0@cdc.gov; evp4@cdc.gov; dyn2@cdc.gov),
2. Corresponding author, e-mail: uzj6@cdc.gov