Abstract
The current research program of the Department of Microbiology of the Harvard School of Public Health includes several problems which were selected for their public health implications as well as for their intrinsic academic interest. The staff is primarily concerned with the microorganisms which cause certain of the major insect-transmitted epidemic diseases of man. Investigations are being conducted on the biology of certain intracellular parasites, the rickettsiae studies are in progress on various arthropods as experimental hosts for viruses and rickettsiae, and knowledge is being sought concerning the epidemiology of various epidemic diseases.