Southern Manchuria, where the Chinese, as the native race and the Japanese, as immigrants, live under the same environment affords an appropriate field to study racial differences of natural immunity. Experienced physicians here believe that the morbidity in scarlet fever of the Japanese is far greater than that of the Chinese. According to the investigation of antiscarlatinal committee of the Kwantung Government the morbidity of the Japanese residents is 3.06 per cent while that of the Chinese is only 0.12 per cent. These figures were obtained by dividing the number of scarlet fever cases occurring between 1921 and 1925 and treated by hospital and civil physicians attached to the S. M. R. Company by the number of the population living during the same period within the area under the jurisdiction of the Local Affairs Department of the S. M. R. Company. While these figures generally seem to be correct, the fact that there are some scarlet fever cases among the Chinese failing to make returns, should be taken into consideration. During the same number of years, in Kwantung Province, the morbidity in the same disease among the Japanese is 2.56 per cent while that of the Chinese is only 0.02 per cent. In either case the morbidity of the Japanese residents is far greater than that of the Chinese.
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Ando et al. (1929) studied this question.