It has long been recognized that pneumonia is a serious complication of pregnancy with a considerably higher death rate than for nonpregnant women.1 Some of the factors pertaining to pregnancy have received limited attention in the past,2 but data concerning the pneumonias are scarce. From the practical possibilities of reducing mortality, recent developments in the fields of specific serum therapy and of chemotherapy have focused attention on the etiologic agents in infectious diseases, and this has been true particularly in the case of the pneumonias. References to the bacterial incitants of the pneumonias of pregnancy are very scarce and, until the recent reports of Bullowa3 and of Rogers and Gooch,4 have been limited to individual case reports.
There is at present a widespread interest among physicians and public health workers in the control of the mortality from pneumonia. Much of this attention is focused on etiologic