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A patient presents with fever, cough with sputum and weight loss. He has a history of not completing treatment for tuberculosis thrice in the past. XDR-TB is suspected. How is XDR-Tb defined?

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Correct Answer:
Resistant to INH + Rifampicin + Amikacin + Ofloxacin
Description:
XDR-TB (Extensively drug-resistant TB) is defined as MDR TB (Resistant to rifampicin and isoniazid) + Resistant to one fluoroquinolone (eg. ofloxacin) + resistance to one injectable second line drug (Amikacin or kanamycin or capreomycin). Reference: Ananthanarayan and Paniker&;s Textbook of Microbiology Tenth edition
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