Which of the following bacteria is known for causing pus formation?

Streptococcus pyogenes is known for its role in pus formation due to its ability to cause various infections, particularly skin and soft tissue infections such as cellulitis and impetigo. This bacterium is a beta-hemolytic streptococcus, which means it can completely lyse red blood cells, leading to significant inflammation and the accumulation of pus—a thick fluid comprised of dead white blood cells, bacteria, and tissue debris. The immune response elicited by these infections results in a marked inflammatory reaction, which promotes the formation of pus as the body attempts to isolate and eliminate the infection.

Additionally, Streptococcus pyogenes is associated with more serious conditions such as necrotizing fasciitis and streptococcal throat infections, both of which further support its reputation for pus production. In contrast, other bacteria listed may contribute to infections but do not have the same strong association with pus formation as Streptococcus pyogenes does, since their pathogenic mechanisms differ significantly.