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There are three basic bacterial shapes:

Spheres or ball-shaped (cocci bacteria)

Rod-shaped bacteria (bacilli)

Spirals or helixes (spirochetes)

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Scientists classify and define bacteria in several ways.

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Aerococcus urinae: Bacteria in urine that cause urinary tract infections.

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Bacterial pathogens can cause foodborne illness.

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Most types of bacteria aren’t harmful.

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There are millions of different types of bacteria.

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Bacteria can harm humans by replicating quickly in our bodies, killing cells.

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A bacterium is a single cell. Additionally, it can live and reproduce almost anywhere.

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Bacteria are extremely adaptive and can quickly evolve to evade antibiotics.

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Bacteria are more complex than viruses and can spread through the air.