Final answer:
Tuberculosis is the disease from the options given that is not caused by a virus, but rather by a bacterium called Mycobacterium tuberculosis.
Step-by-step explanation:
All of the following are caused by a virus except tuberculosis. Tuberculosis is actually caused by a bacterium known as Mycobacterium tuberculosis. On the other hand, conditions like croup, acute bronchitis, and epiglottitis can be viral in nature, but acute bronchitis and epiglottitis can also have bacterial causes. Diseases such as pneumonia can be caused by various viruses including the influenza virus types A and B, parainfluenza virus, respiratory syncytial virus, adenovirus, and SARS coronavirus.