Severe Acute Respiratory Syndrome (SARS) is caused by a variant of -
Common cold Coronavirus
Coronaviruses are common throughout the world. They can infect people and animals. Over 200 different coronaviruses can infect people and make them sick. They usually cause mild to moderate upper-respiratory illness. But, some coronaviruses, like the one that caused SARS (Severe acute respiratory syndrome) pandemic in 2003, can cause severe illness and death.