diplococcus

The term "diplococcus" refers to a type of bacterium that typically appears in pairs. Historically, these were grouped into a single genus, but are now classified into other genera. A common example is Streptococcus pneumoniae, a bacterium that can cause pneumonia.1

Streptococcus pneumoniae, also known as pneumococcus, is a spherical bacterium that can lead to various human illnesses, including pneumonia, sinusitis, and meningitis. These bacteria are normally found in the upper respiratory tract without causing symptoms in healthy individuals. However, they can become pathogenic in those with weakened immune systems.2

Cocci are spherical bacteria, and their arrangements are important for identification. Diplococci are pairs of cocci, while streptococci form chains, and staphylococci form grapelike clusters.3