Which type of bacterial cells shape appears as a bar or rod?

Bacilli refer to rod-shaped bacterial cells. This shape is characteristic of certain types of bacteria that have a cylindrical form, resembling a bar or a rod. Bacilli can exist as single cells, in pairs, or in chains, and their structure allows them to occupy various environments, sometimes leading to distinctive patterns of growth. Understanding the morphology of bacteria, including bacilli, is crucial in fields like esthetics and health care, as it can impact how infections are treated or managed. Recognizing bacilli among other types of bacterial shapes—such as cocci (which are spherical) or spirilla (which are spiral)—is fundamental in both microbiology and clinical practices.