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SARS coronavirus, computer artwork. SARS (severe acute respiratory syndrome) virus particles consist of an outer protein coat (capsid) encasing RNA (ribonucleic acid), the genetic material of the virus. Bulbous projections on the capsid surface give this virus its corona, or crowned, appearance. SARS causes high fever and flu-like symptoms. (KEYSTONE/SCIENCE PHOTO LIBRARY/ANIMATE4.COM/SCIENCE PHOTO LIBARY)