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Coronavirus or corona virus is a large family of viruses that cause mild to moderate upper respiratory tract infections, such as flu.  Many people are infected with this virus, at least once in their life.

SARS, which emerged in November 2002 in China, spread to several other countries.  Starting from Hong Kong, Vietnam, Singapore, Indonesia, Malaysia, England, Italy, Sweden, Switzerland, Russia, to the United States.  The SARS epidemic, which ended in mid-2003, infected 8,098 people in various countries.  At least 774 people must have lost their lives due to this severe respiratory tract infection.