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Noguchi has made an emulsion of dead spirochætes which he calls luetin, and which gives a specific reaction resembling that of tuberculin in tuberculosis, a papule or a pustule forming at the site of the intra-dermal injection. It is said to be most efficacious in the tertiary and latent forms of syphilis, which are precisely those forms in which the diagnosis is surrounded with difficulties.
It involves some risk, and is no substitute for efficient treatment by the more familiar methods. If necessary, a patient can have the benefit of both. The luetin test was devised by Noguchi for the presence of syphilis, and is performed by injecting into the skin an emulsion of dead germs. A pustule forms if the test is positive.
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