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TB InfectionTB Infection When a person has been infected with Mycobacterium tuberculosis they have a tuberuclosis infection, which is different than having tuberculosis. Tuberculosis infection is asymptomatic and is confirmed by a positive purified protein derivative (PPD) skin test. The PPD is derived from a protein found in the tuberculosis bacteria. The protein stimulates a response (localized swelling) in a person whose immune system has been exposed to the bacteria. A certain size swelling i...Read the full article
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