How do you read a TB skin test?

The purified protein derivative test confirms whether someone has had exposure to tuberculosis, a serious infectious disease. A positive test result indicates that the person may have a tuberculosis infection, but it does not necessarily mean that they have active tuberculosis.

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All you need to know about tuberculosis

Screen Shot 2019 03 01 at 12.36.54 PMTuberculosis is an infectious disease that usually affects the lungs. Compared with other diseases caused by a single infectious agent, tuberculosis is the second biggest killer, globally.

In 2015, 1.8 million people died from the disease, with 10.4 million falling ill.

In the 18th and 19th centuries

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