24 percent of medical scientists were employed in government; 24 percent were employed in scientific research and development services firms ; 14 percent were employed in pharmaceutical and medicine manufacturing; 9 percent were employed in private hospitals; and most of the remainder were employed in private educational services and ambulatory health care services.
Among epidemiologists, 50 percent were employed in government; 23 percent were employed in management, scientific, and technical consulting services; 12 percent were employed in scientific research and development services; and 8 percent were employed in private hospitals..
Source: Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2006-07 Edition