Transmission
Human parainfluenza viruses (HPIVs) usually spread from person to person through—
- the air by coughing and sneezing,
- close personal contact, such as touching or shaking hands, and
- touching objects or surfaces that have HPIVs on them then touching your mouth, nose, or eyes.
HPIVs can stay in the air for over an hour and on surfaces for a few hours and still infect people.
People usually get HPIV infections in the spring, summer, and fall. For more information, see HPIV Seasons.
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