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SARS

  1. serious
    serious; grave; critical; severe; used to describe a dangerous situation or a deep level of impact
  2. acute
    occurring suddenly and developing rapidly, usually in reference to an illness
  3. respiratory system
    The system of organs in humans and animals responsible for exchanging gases between the body and the environment; in humans it includes the nose, throat, larynx, trachea, bronchi, and lungs.
  4. syndrome
    syndrome; a group of signs and symptoms that occur together and characterize a particular disease or condition