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Why do you become ill after visiting a friend who is sick with influenza?

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The room your friend was in was too warm

You ate the same kind of food your friend ate

You did not dress properly

The virus that causes the influenza entered your body

answer is D.

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Detailed Solution

One can spread the influenza virus to others for up to 24 hours before one develops symptoms.

Other respiratory illnesses common during cold and flu season are contagious as long as you have symptoms or even a few days after your symptoms improve.

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