Bacteria are among the smallest living things. A single bacterium consists of just one cell, and is called a single-celled, or unicellular organism. There are millions of different types of bacteria.

Vaccine Preventable Bacterial Diseases, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB, Canada Paraphrasing the authors of the editorial comments, 2,3 capsule switching ...

Here, gut cells release the alkaline bicarbonate ... through the wall of the gut and the activity of the gut bacteria changes. "The capsule registered all these changes in pH values, and we ...

and he observed that these bacteria had the smooth capsules characteristic of the S strain. Based on these observations, Griffith hypothesized that a chemical component from the virulent S cells ...