What bacteria type is known for appearing in chains and also being pus-formers?

The identification of the bacteria type known for appearing in chains and being pus-formers points to streptococci. This genus of bacteria is characterized by its spherical shape (cocci) and its tendency to arrange themselves in chains after cell division. Streptococci are significant in clinical settings due to their association with various infections, including strep throat, skin infections, and more severe conditions such as pneumonia.

The formation of pus is often linked to the body’s immune response to streptococcal infections, where white blood cells accumulate at the site of infection, resulting in pus. Therefore, the ability of streptococci to cause purulent infections underlines their significance in both microbiology and clinical practice.

The other choices represent different types of bacterial arrangements and characteristics, but they do not share the traits of chaining and pus formation in the same manner as streptococci do. Understanding the unique features of each type of bacteria helps in recognizing their implications in health and disease.