Bacterium

The toxin that causes diphtheria is produced by a normally benign bacterium when infected with a certain virus.

This bacterium is resistant to penicillin.

Do not confuse a virus with a bacterium.

Koalas face many threats, including chlamydia – a bacterium that can cause pneumonia and infertility.

Scientists were surprised to find the grapevines they studied harbored Propionibacterium acnes, a bacterium usually found on human skin and best known for causing acne.

The two men do not work together any more, but back in 1982 they made what the Nobel Committee called "the remarkable and unexpected discovery" that gastritis and peptic ulcer disease are the result of an infection caused by a then-unknown bacterium.

The bacterium that causes tuberculosis can lie dormant for years before taking advantage of a weakened immune system to 'wake up' and spread.

In a mouse model, the scientists trained the body’s natural immune system, called innate immunity, to disarm and destroy a bacterium that causes a kidney infection, often in children.

That revelation came as Chilton was studying a plant infection called crown gall. Caused by a bacterium called Agrobacterium tumefaciens, crown galls are ugly lumps of prolific plant cell growth.

If the Bacterium coli normal to the intestine escapes into the peritoneal cavity, or passes into the bladder, a severe peritonitis or cystitis, respectively, is apt to result.