Germ may refer to:
Germs may refer to:
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Germs are bacteria, amoeba, protozoa and other tiny (microscopic) animals that may cause sickness. Most germs have only one cell, but they multiply quickly. The germ group excludes viruses, since they are not considered alive, although some people call viruses "germs" in everyday speech.
Some germs are beneficial in many ways: Yeast that make bread rise are germs. Oxygen we breathe is produced by microscopic algae. Fungi are used to make cheese, and different kinds of bacteria, known as probiotics, are used to make yogurt. Germs are also used to make medicines, and they even clean nuclear waste.