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The TB pores and skin test is often a test used to ascertain if a person is contaminated with TB bacteria. During this test, a standardized Remedy designed with purified protein spinoff (PPD), which is derived from tuberculin, is injected under the skin.누구도 알려주지 않는 해외 신규 거래처 발굴 비법 - 크몽 전기전자해외