1. U.S. Food and Drug Administration, 5100 Paint Branch Pkwy, College Park, MD 20740-3835,., Tel: 301-436-2008, Fax: 301-436-2644
2. U.S. Environmental Protection Agency, Environmental Science Center, OPP Microbiology Laboratory, 701 Mapes Rd, Ft. Meade, MD 20755-5350,., Tel: 410-305-2976, Fax: 410-305-3094