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Bacteria and Viruses

n. one-celled organisms that often cause illnesses
Bacteria
Bacteria are single-celled organisms. Some bacteria are

v.
to go into a place to attack it
invade
harmful to humans. If bacteria invade your body, you can

become sick. Bacteria love the inside of a

human body. It is warm and moist—an

excellent place for bacteria to grow.

Usually, white blood cells can kill

harmful bacteria in your body. But

sometimes there are too many to kill.

various types You might need antibiotics.
of bacteria

Unit 11 | Bacteria and Viruses