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serious
serious; grave; critical; severe; used to describe a dangerous situation or a deep level of impact
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acute
occurring suddenly and developing rapidly, usually in reference to an illness
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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.
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syndrome
syndrome; a group of signs and symptoms that occur together and characterize a particular disease or condition