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We were absolutely blocked, for instance, by it in smallpox and syphilis until we discovered that our nearest blood relatives, the ape and the monkey, are susceptible to them; and then the Cytoryctes Variolæ and the Treponema pallida were discovered within comparatively a few months.
The commonest and most fatal of all forms of general diseases of the nervous system are those which are due to the later extensions of general infections. First and foremost stands syphilis, due to the invasion of the blood by a clearly defined spirillum, the Treponema pallida of Schaudinn.
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