Affiliation: | 1.Division of Vector-Borne Diseases, National Center for Emerging and Zoonotic Infectious Diseases, CDC, San Juan, Puerto Rico; 2.Wake Forest School of Medicine, Winston-Salem, North Carolina, 3.University of Maryland School of Medicine, Baltimore, Maryland; 4.Michigan State University, East Lansing, Michigan; 5.Baylor College of Medicine, Houston, Texas |