SANDRA MONTERO returned to her office after dropping off Sandra Jr. at day care. Sandra always tried to incorporate exercise into her work routine, so after giving the security guard a friendly smile, she turned into the stairwell to make her usual four-flight climb up the stairs, as her doctor recommended. After the first few steps, she felt her thigh muscles ache and suddenly felt tired all over. She lumbered into her office, started to cough, and decided to visit the company physician.

After sitting for almost half an hour in the clinic, the doctor told her that she had the flu. Sandra went home for the rest of the day with instructions to drink plenty of fluids and take some over-the-counter medications. ...

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