1. Polio and Picornavirus Laboratory Branch, Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. IHRC Inc., Atlanta, Georgia, USA
3. Division of Scientific Resources, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Cherokee Nation Businesses, Catoosa, Oklahoma, USA
5. Department of Medical Laboratory Sciences, University of Maiduguri, Maiduguri, Borno State, Nigeria
6. National Polio/ITD Laboratory, University of Maiduguri Teaching Hospital, Maiduguri, Nigeria
7. Department of Microbiology, University of Maiduguri, Maiduguri, Nigeria
8. Department of Virology, University of Ibadan, Ibadan, Nigeria