4 Things Everyone Should Know About Virus

The current 2019 new Coronavirus (SARS-CoV-2) outbreak in China and its subsequent spread to multiple countries across four continents has triggered a major global health crisis, which makes everyone around the world focus on the virus. What exactly is a virus? Why is it such a big threat? This article will briefly introduce these questions. What is a virus in biology? Virus is a non-cellular life form, mainly composed of nucleic acids and proteins. It does not have metabolic capacity itself and needs to rely on the host cell's metabolic system to complete proliferation. In other words, a virus is a protein shell that encloses genetic materials. While the protein shell provides structural support and protection, it also helps the virus find host cells.

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