Health A-Z

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Expected Duration

Symptoms usually are most intense during the first two to four weeks of the illness. But some symptoms, especially fatigue, can last for several months or longer.

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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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