This is a photomicrograph of the organism that causes pneumococcal pneumonia. The bacterium is round, but join together to form pairs and chains. Because they typically join together to form pairs, they are called diplococci; the prefix di means two.
Reviewed By: Allen J. Blaivas, DO, Division of Pulmonary, Critical Care, and Sleep Medicine, VA New Jersey Health Care System, Clinical Assistant Professor, Rutgers New Jersey Medical School, East Orange, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.