Address correspondence to Ondrej Mach, Global Immunization Division, Centers for Disease Control and Prevention, Mailstop E05, 1600 Clifton Road, Atlanta, GA 30333. E-mail:
Authors’ addresses: Ondrej Mach, Lydia Lu, Tracy Creek, Anna Bowen, Wences Arvelo, Muireann Brennan, and Thomas Handzel, Global Immunization Division, Centers for Disease Control and Prevention, Mailstop E05, 1600 Clifton Road, Atlanta, GA 30333, E-mail:
Acknowledgments: We thank L. Zaks, A. Kim, T. Finkbeiner, B. Woodruff, E. Mintz, N. Shaffer, C. Bern, M. Davis and others in Botswana and Atlanta for their participation in this study.
Financial support: This study was supported by the Centers for Disease Control and Prevention. However, there was no special grant or fund made available specifically for this investigation; operational funds for outbreak response were used.
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