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Fifth disease is caused by parvovirus B19 and is spread by respiratory secretions from an infected person. By the time the rash appears, children are no longer contagious and may attend school or day care. The incubation period (the period between infection and signs or symptoms of illness) is usually four to 14 days, but can be as long as 21 days. Adults who work with young children -- such as child-care providers, teachers, and those in health care fields -- are most likely to be exposed.

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Archived: March 20, 2014

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Read the Original Article: Understanding Fifth Disease -- the Basics