Authors’ addresses: Manuela Verastegui, Yanina Arana, Cesar Jeri, and Iskra Tuero, Department of Microbiology, Universidad Peruana Cayetano Heredia, PO Box 5045, Lima, Peru. Robert H. Gilman, Department of International Health, Johns Hopkins University School of Hygiene and Public Health, 615 North Wolfe Street, Room 3501, Baltimore, Maryland 21205, Telephone: 410-614-3959, Fax: 410-614-6060, E-mail:
Acknowledgments: We thank J. B. Phu, D. Sarah, and G. Sari-Cece for technical assistance.
Financial support: This work was partially funded by the International Centers for Infectious Diseases Research grant 01A135894-06 from the National Institutes of Health, Actions to Build Capacity and International Training and Research in Emerging Infectious Diseases grants from the Fogarty Foundation, and the anonymous RG-ER Fund.
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