Alopecia, influenza-like symptoms and a copper-colored rash can be observed in infections with which organism?

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Alopecia, flu-like symptoms, and a copper-colored rash are classic features of secondary syphilis caused by Treponema pallidum. After the initial chancre, the infection spreads systemically, producing a widespread mucocutaneous eruption. The scalp can develop patchy, non-scarring hair loss described as moth-eaten alopecia, and many patients experience influenza-like symptoms from the body's inflammatory response and generalized involvement. The copper-colored rash on the trunk and extremities is a hallmark of this stage, reflecting the broad dissemination of the spirochete. The other organisms listed produce different clinical pictures—for example, Yersinia pestis causes plague with abrupt fever and buboes, Vibrio cholerae causes severe watery diarrhea, and Mycoplasma pneumoniae tends to cause atypical pneumonia—so they don’t fit this combination of findings.