Frequency of nonparenteral occupational exposures to blood and body fluids before and after universal precautions training: Fahey B J, Koziol DE, Banks SM, Henderson DK. Am.J Med 1991;90:145-53. Reprint requests: David K. Henderson, MD, Building 10, Room 2C 146, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892.