Which should you use, bacteria, bacterias, bacterium or bacteriums? Bacteria is the plural form of bacterium. A bacterium is a very small living thing that is made of a single cell. Bacterias and bacteriums are incorrect.
| Incorrect: |
What are the bacterias that make you sick?
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| Correct: |
What are the bacteria that make you sick?
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| Incorrect: |
A lot of bacteriums are destroyed by the digestive process.
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| Correct: |
A lot of bacteria are destroyed by the digestive process.
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