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Ravaut has been writing on neurosyphilis during the whole period of its scientific evolution, that is, for thirty years, and presents a number of interesting conclusions in this attractive volume. He deals particularly with the biologic form or latent or preclinical neurosyphilis, which is detectable only by examination of the spinal fluid. He points out the much greater success of treatment in the latent or preclinical forms than in forms that have gone on to definite neurologic manifestations. From the prognostic standpoint, the biologic reactions to syphilis are of considerable importance, positive reactions being danger signals, although negative reactions are not always to be relied on; partial reactions must be interpreted with care. It seems that negative reactions in the spinal fluid of a treated patient usually remain negative. Occasional unusual manifestations are bound to occur, so that absolute predictions cannot be made.
Une nouvelle syphilis nerveuse; ses formes cliniquement inapparentes.. Arch NeurPsych. 1934;32(6):1372. doi:10.1001/archneurpsyc.1934.02250120249026