Turner, Thomas B. School of Medicine, Johns Hopkins University, Baltimore, Maryland.
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An infectious disease of humans caused by the spirochete Treponema pertenue. It is also known as frambesia and is largely confined to the tropics. Anecdotal information indicates that yaws still exists in parts of central Africa, South America, India, and Indonesia. Usually yaws is contracted in childhood by direct contact or from small flies feeding in succession on infected lesions and open wounds. No race or age possesses natural immunity.
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