The Flu, influenza, is highly contagious and is caused by a virus most commonly attacking the lungs. When the flu is not treated, it can also lead to very serious illnesses such as pneumonia and can be considered fatal. The flu can be prevented with a vaccination.
Symptoms:
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muscle aches
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fever lasting 2-3 days
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weakness
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runny nose
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feeling tired for 2-3 weeks
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sore throat
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headache |
cough |
