Which type of bacteria are known to form pus and cause abscesses?

Staphylococci bacteria are known for their ability to form pus and cause abscesses. This type of bacteria is a common cause of skin infections, which can result in localized collections of pus characterized by swelling, redness, and pain. When the immune system fights off an infection caused by these bacteria, it produces pus, which is composed of dead white blood cells, bacteria, and tissue debris.

Staphylococci are particularly notable in clinical settings for being responsible for various types of skin infections, including boils and other forms of abscesses. Their role in pus formation is well-documented, making them a primary focus for treatment in cases of skin infections.

In contrast, other types of bacteria mentioned in the options do not primarily produce pus or lead to abscess formation in the same way. Streptococcus bacteria can cause infections, but they typically lead to different types of inflammatory responses rather than pus accumulation. Non-pathogenic bacteria do not cause diseases, so they do not produce pus. Escherichia coli, while it can cause infections, is not commonly associated with pus-forming abscesses as Staphylococci are. Thus, Staphylococci is the correct answer based on their unique association with pus and abscess development