Which organisms are pus-forming bacteria that grow in clusters like bunches of grapes?

• A. Streptococci
• B. Bacilli
• C. Staphylococci
• D. Cocci

Answer: (C)

Pus-forming bacteria that cluster like bunches of grapes are staphylococci. These are spherical bacteria that divide in multiple planes and stay attached, creating the distinctive grape-like clusters you’re asked to recognize. They’re also known as pyogenic, meaning they readily produce pus in infections such as boils and abscesses.

In contrast, streptococci tend to form chains, bacilli are rod-shaped, and cocci is just a general shape not tied to a specific grouping or pus production. So the combination of the grape-cluster arrangement and pus-forming behavior points to staphylococci.