An infectious disease caused by bacilli and treated with INH?

The answer is tuberculosis.

The causative agent of tuberculosis is Mycobacterium tuberculosis, which is a bacillus. The primary treatment for tuberculosis is isoniazid (INH), which is an antibiotic that is effective against the bacteria that cause tuberculosis. Other medications, such as rifampin, pyrazinamide, and ethambutol, are also used to treat tuberculosis.