Which type of bacteria is characterized as round-shaped and pus-forming?

The correct answer is Staphylococci, which are round-shaped bacteria known for their ability to form clusters resembling grapes. These bacteria are particularly associated with pus formation, as they can lead to infections such as boils, abscesses, and skin infections. Staphylococci are capable of producing toxins that can damage tissues and elicit immune responses, leading to the accumulation of pus as the body attempts to fight off the infection.

Understanding the morphology and behavior of Staphylococci is critical in fields like food safety and sanitation, as their presence can indicate contamination and pose health risks. Correct identification of these bacteria aids in implementing appropriate sanitary measures and treatments in clinical and food production environments.

The other types of bacteria mentioned have different characteristics and are not associated with pus formation. Bacilli are rod-shaped bacteria, Spirilla are spiral-shaped, and Vibrio are comma-shaped. Each of these shapes presents unique behaviors and implications for sanitation, but none produce pus in the manner that Staphylococci do. This distinction is essential for effectively addressing and managing bacterial infections in various settings.