Mija Ververs1, Rupa Narra2. 1. Division of Global Health Protection, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA. Electronic address: mververs@cdc.gov. 2. Division of Foodborne, Waterborne, and Environmental Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.