Viruses

Coronaviruses are enveloped and about 120 nanometer in size, and they resemble tiny suns or wreaths due to the shape of their protein spikes. They're named for their looks as well, as corona is Latin (as well as Spanish and Italian) for 'crown'. Coronaviruses usually infect the respiratory tract (humans), the gastrointestinal tract, liver and brain. The diseases they cause ranges from mild to lethal. There are seven species known to cause disease in humans, which are HCoV-229E, HCoV-HKU1, HCoV-NL63, HCoV-OC43, SARS-CoV-1, MERS-CoV and SARS-CoV-2. The last three mentioned can be lethal in both humans and, especially SARS-CoV-2, some other animals.

Young virions develop in their host-cell's golgi system and then leave it by exocytosis. This process doesn't kill the host-cell directly, but the cell will eventually die because it uses all of its own inner resources as fuel to produce the virions from.