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Bacterium is the singular form of the word. While the plural bacteria is often used as if it were the singular, this is nonstandard. See the examples below.
- Standard usage
- Scientists have discovered a bacterium that infects cattle.
- There are millions of bacteria on every square inch of your skin.
- Nonstandard usage
- * The common cold is caused by a virus, not a bacteria.
- * The bacteria in the wound causes infection.
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