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Human parainfluenza viruses

Human parainfluenza viruses (HPIVs) are a group of four distinct serotypes of single-stranded RNA viruses belonging to the paramyxovirus family.

They are the second most common cause of lower respiratory tract infection in younger children.

Note:   The above text is excerpted from the Wikipedia article "Human parainfluenza viruses", which has been released under the GNU Free Documentation License.
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May 23, 2015

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updated 12:56 pm ET