Which type of bacteria is typically spherical in shape?

Cocci are the type of bacteria that are typically spherical in shape. This morphology is significant in microbiology because the shape of bacterial cells can influence their behavior, pathogenicity, and the way they interact with their environment. Cocci can exist as single cells, in pairs (diplococci), chains (streptococci), or clusters (staphylococci), reflecting their method of division and colonial arrangement.

In contrast, spirilla are spiral-shaped bacteria, which can exist in various forms such as rigid spirals. Bacilli are rod-shaped bacteria and are known for their elongated structure. Vibrios are curved or comma-shaped bacteria. Each of these shapes plays a role in the identification and study of microorganisms, making it essential to understand the characteristics of different bacterial forms, particularly when it comes to diagnostics and understanding infections.