Which type of bacteria grows in clusters and is commonly found in local infections?

Staphylococci is indeed the type of bacteria that grows in clusters and is frequently associated with local infections. This spherical-shaped bacteria forms grape-like clusters due to the way it divides in multiple planes. Staphylococcus aureus, a specific strain, is particularly known for causing skin infections, boils, and abscesses, emphasizing its role in localized infections.

In contrast, streptococci typically grow in chains and are often involved in conditions like strep throat and skin infections, but do not form clusters. Diplococci, which grow in pairs, include organisms like Neisseria, the causative agent of certain sexually transmitted infections and meningitis. Bacilli, on the other hand, are rod-shaped bacteria that can also be implicated in various infections, but they do not grow in clusters. Thus, the distinct characteristic of staphylococci growing in clusters sets it apart as the correct answer, particularly in the context of local infections.