Public Health Service Comstock joined the
United States Public Health Service in 1942 and served as captain for 21 years. During this time, he conducted the first trials of the BCG vaccine for tuberculosis in Georgia and Alabama (1947–1951). The results of these trials were key in the decision not to implement the vaccine in the United States.
Public health education He received a
Master of Public Health from the
University of Michigan School of Public Health in 195? and Doctorate of Public Health in Epidemiology from
Johns Hopkins School of Public Health in 1956. He subsequently joined their faculty and taught there for more than 50 years.
Tuberculosis treatment research In 1957, he led research in
Bethel, Alaska, estimating the high burden of tuberculosis and demonstrating the drug
isoniazid's effectiveness in preventing the disease. ==Awards and contributions==