Recently, there have been scattered reports of infection in man withBrucella abortus. Evans1and Keefer2in America and Orpen3of South Africa have described such cases; and as the course of the disease is quite similar to, if not identical with, Malta fever, which is caused byBrucella melitensis, we feel that the cases reported here should be presented, in hope that some light may be thrown on the frequency with whichBrucella abortusmay be incriminated as a disease-producing agent in man. Bovine infectious abortion, which is due to this organism, is a widespread disease that causes enormous losses to the cattle industry. This organism not only is responsible for the premature expulsion of the fetus by producing an inflammation of the placental tissue, but also localizes in the udders of cattle in many cases, from which it is discharged with the milk. Because of