bio

Type

Description

Examples

Some Disorders That Can Result

Bacteria

Bacteria are microscopic, single-celled organisms without a nucleus.

Streptococcus pyogenes

Pharyngitis (strep throat)

Escherichia coli

Urinary tract infections

Viruses

Viruses are small infectious organisms—much smaller than a fungus or bacterium. They cannot reproduce on their own. They must invade a living cell and use that cell's machinery to reproduce.

Varicella zoster

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