There are several types of spirilla, including:

* Vibrios: These are slightly curved, comma-shaped bacteria.

* Spirilla: These have a rigid, helical (corkscrew-like) shape.

* Spirochetes: These are flexible, spiral-shaped bacteria with axial filaments that allow them to move in a corkscrew motion.

Some well-known examples of spirilla include:

* Vibrio cholerae: The bacterium that causes cholera.

* Treponema pallidum: The bacterium that causes syphilis.

* Borrelia burgdorferi: The bacterium that causes Lyme disease.

It's important to note that not all spiral-shaped bacteria are harmful. Some are actually beneficial, like certain bacteria that live in our gut.