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In the spring of 1925, Dr. Plaut with Professor Kraepelin visited the United States, Mexico and Cuba for the purpose of studying the incidence of syphilis and particularly of general paralysis of the insane among the negroes and Indians. The present volume is the report of that study. A view formerly given wide credence in this country and still apparently given some credence in Europe is that the so-called metasyphilitic conditions, general paralysis and tabes dorsalis, are of rare occurrence in the negro. In the United States it is found that general paralysis of the insane occurs in about the same proportion of negroes infected with syphilis as it does in white persons infected with the same disease. Syphilis has a much greater incidence in the negro population than it does in the white population. A fact brought out by the study, but not explained, is that general paralysis in
Paralysestudien bei Negern und Indianern. Ein Beitrag zur vergleichenden Psychiatrie.. JAMA. 1927;89(12):991. doi:10.1001/jama.1927.02690120067047