Because CO is odorless, colorless, and otherwise undetectable to the human senses, people may not know that they are being exposed. The initial symptoms of low to moderate CO poisoning are similar to the flu (but without the fever). They include:
- Shortness of breath
High level CO poisoning results in progressively more severe symptoms, including:
- Mental confusion
- Loss of muscular coordination
- Loss of consciousness
- Ultimately death
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