Which bacteria are known for forming clusters that resemble grapes?

Staphylococci are known for their distinctive clustering pattern that resembles grapes. This characteristic formation occurs because these bacteria divide in multiple planes but remain attached after cell division. As a result, they form irregular clusters or groups, giving them the appearance of bunches of grapes when viewed under a microscope. This unique morphological trait is used in microbiology to help identify and differentiate Staphylococci from other types of bacteria.

In contrast, streptococci tend to form chains of round bacteria due to their division in a single plane and subsequent attachment. Bacilli refer to rod-shaped bacteria that can appear singly or in chains but do not cluster in a grape-like manner. Spirilla are spiral-shaped bacteria that also do not form grape-like clusters and typically have a more distinct helix shape.