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Bronchitis often progresses to a more severe lung condition called _____________________, which was the leading world killer around 1900 A.D.

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Answer: Tuberculosis

Explanation: Tuberculosis is caused by the microorganism called Mycobacterium tuberculosis.

Tuberculosis can also be caused by Tubercle bacillus. Tuberculosis is characterized by sever cough , chest pains shortness of breath. Often times individuals who have untreated tuberculosis start coughing out blood.