What disease is commonly caused by a coccus bacterium?

The disease commonly caused by a coccus bacterium is strep throat, which is primarily caused by Streptococcus pyogenes. This bacterium falls under the category of cocci, which are spherical-shaped bacteria. Strep throat is an infection of the throat that leads to symptoms like a sore throat, fever, and swollen lymph nodes, among others.

The other diseases listed are caused by different types of pathogens. Syphilis is caused by the bacterium Treponema pallidum, which is a spirochete, not a coccus. Tuberculosis is caused by Mycobacterium tuberculosis, which is a rod-shaped bacterium (bacillus), and influenza is caused by a virus, not a bacterium at all. Understanding the specific types of bacteria that cause various diseases is important for diagnosis and treatment in medical practice.