What Is Tuberculosis (TB)?

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8. How Drug-Resistant Is TB?

When some of the bacteria survive treatment, strains can become resistant to the particular drugs used. This is happening with strains of Mycobacterium tuberculosis. TB that is caused by strands of the bacteria resistant to the two most potent drugs — isoniazid and rifampin — is called multidrug-resistant TB.

There are rare instances when a person is infected with bacteria resistant to both of the aforementioned drugs along with fluoroquinolone and at least one second-line drug. This is known as extensively drug-resistant TB. A person with this form has few treatment options available.

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