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Audio Interchange File Format  |  1996-12-09  |  457.6 KB  |  1 channel  |  11,025 sample rate  |  21 seconds
Transcription: Virus. A tiny infectious agent that is smaller than bacteria. Many common infections such as colds and hepatitis are caused by viruses. Viruses invade cells, alter the cell's chemistry, and cause them to produce more virus. Several viruses produce cancers in animals. Their role in the development of human cancers is now being studied.