What is coronavirus and how worried should we be?
Have there been different coronaviruses? New and troubling viruses often originate in animal hosts. Ebola and flu are different examples – severe acute respiratory syndrome (Sars) and Center Jap respiratory syndrome (Mers) are both caused by coronaviruses that got here from animals. In 2002, Sars spread virtually unchecked to 37 nations, causing world panic, infecting…