German: Virus
Japanese: ウイルス

Microbiology. A noncellular microbial entity (diameter 15-300 nm) that can live and reproduce only in susceptible host cells. They consist of DNA or RNA and a protein coat. Viruses infect bacteria, plants, and animals. More than 200 types have been identified as capable of causing diseases in humans, such as influenza, measles, smallpox, and herpes.

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