What is a coronavirus?


coronaviruses are a family of hundreds of viruses that can cause fever, respiratory problems, and sometimes gastrointestinal symptoms too. the 2019 novel coronavirus, which is probably why you're reading this right now, is one of seven members of this family known to onfect homans, and the third in the past three decades to jump from animals to humans. a pneumonia-like disease, the 2019 novel coronavius has caused a global health emergency, sickened more than 31,000 people worldwide, and killed nearly 650 so far. coronaviruses are divided into four gerena: alpha, beta, gamma, and delta. mostly, if you got a coronvirus, you'd end up with a cold. coronaviruses are made up of one strip of RNA, and that genetic material is surrounded by a membrane studded with little spike proteins. (under a microscope, those proteins stick up in a ring around the top of the virus, giving it its name--"corona" is Latin for "crown."). when the virus gets into the body, those spike proteins attach to host cells, and the virus injects that RNA into the cell's nucleus, hijacking the replication machinery there to make more virus. infection ensues.

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