________ (tuberculosis/asthma) is an infectious disease that usually affects the lungs.

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Solution

Infectious disease:
Diseases that are mainly caused by pathogens are known as infectious diseases.
Tuberculosis is an infectious disease caused by a small rod-shaped bacterium, Mycobacterium tuberculosis.
It is spread by sputum(a mixture of saliva and mucus) from infected persons.
Symptoms of tuberculosis include tissue damage in the lung, coughing and loss of weight.
Final answer:
Tuberculosis is an infectious disease that usually affects the lungs.

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