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Bibliography:ark:/67375/HXZ-3D1XVH2K-S
istex:D521EAB12CEF6ABA4E912DE2FFA39C4AD6D91325
This investigation was supported by Public Health Service research grant AI-02953. Charles J. Schleupner was supported by Public Health Service training grant 68510 B. The authors wish to thank Mrs. Roslyn Brown for excellent technical assistance.
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ISSN:0022-1899
1537-6613
DOI:10.1093/infdis/120.3.348