Which type of bacteria are described as round and pus-producing?

The correct answer is cocci, which describes bacteria that are round in shape. This type of bacteria can be found in clusters or chains and is known for certain strains that produce pus. Understanding this classification is important in the field of nail technology and cosmetology as it relates to sanitation practices and infection control. Pus-producing cocci are often associated with infections and can be a cause of concern when dealing with skin and nail services.

Bacilli, which are rod-shaped bacteria, are distinct from cocci in both shape and their typical associations with disease. Spirilla are spiral-shaped bacteria, and vibrios have a comma-like shape, both of which do not specifically relate to being pus-producing. Therefore, the identification of cocci as the correct answer is rooted in their specific shape and behavior in terms of infection.