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vol. 4 no. 180 pe32
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- 1Department of Medicine (Microbiology and Molecular Genetics), Division of Infectious Diseases, Massachusetts General Hospital and Harvard Medical School, 65 Landsdowne Street, Cambridge, MA 02139, USA.
- 2Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA 01655, USA.
- ↵*Corresponding author. Telephone, 617-768-8349; fax, 617-768-8738; e-mail, clesser{at}partners.org