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| Symptom: | Cold | Flu | |
| Fever: | Rare in adults and older children. Can be 102 degrees F / 38.9 degrees C in small children and infants. |
Usually 102 degrees F / 38.9 degrees celsius but can be up to 104 degrees F or 40 degrees C and lasts 3-4 days. |
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| Headache: | Rare. | Sudden onset and can be severe. | |
| Muscle Aches: | Mild. | Usual, and often severe. | |
| Tiredness/Weakness: | Mild. | Often extreme and can last two or more weeks. |
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| Extreme Exhaustion: | Never. | Sudden onset and can be severe. | |
| Runny Nose: | Often. | Sometimes. | |
| Sneezing: | Often. | Sometimes. | |
| Sore Throat: | Often. | Sometimes. | |
| Cough: | Mild hacking cough. | Usual and can become severe. | |