From the Caliciviruses Section, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD.
Address reprint requests to Dr. Green at the National Institutes of Health, 50 South Dr., Bldg. 50, Rm. 6318, Bethesda, MD 20892, or at [email protected].
Disclosure forms provided by the authors are available with the full text of this article at NEJM.org.
No potential conflict of interest relevant to this article was reported.
We thank Dr. Albert Z. Kapikian for his critical review and suggestions and Dr. Colleen Hadigan for expert clinical advice.
