1. Division of Vector-Borne Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, CO 80521 (mcd4@cdc.gov; lfz2@cdc.gov; fth3@cdc.gov; kje5@cdc.gov; ymm6@cdc.gov; xhk9@cdc.gov; evp4@cdc.gov)
2. Corresponding author, e-mail: evp4@cdc.gov