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</div><div><span>Parainfluenza</span></div></div>
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<article><div id="d-article"><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also" itemprop="name">Parainfluenza</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Parainfluenza refers to a group of viruses that lead to upper and lower respiratory infections.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>Causes</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>There are four types of parainfluenza virus. They can all cause lower or <a test="test" href="./000678.htm">upper respiratory infections</a> in adults and children. The virus can cause <a test="test" href="./000959.htm">croup</a>, <a test="test" href="./000975.htm">bronchiolitis</a>, <a test="test" href="./001087.htm">bronchitis</a> and certain types of pneumonia.</p><p>The exact number of parainfluenza cases is unknown. The number is suspected to be very high. Infections are most common in fall and winter. Parainfluenza infections are most severe in infants and become less severe with age. By school age, most children have been exposed to the parainfluenza virus. Most adults have antibodies against parainfluenza, although they can get repeat infections.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Symptoms</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>Symptoms vary depending on the type of infection. Cold-like symptoms consisting of a runny nose and mild cough are common. Life-threatening respiratory symptoms can be seen in young infants with bronchiolitis and those with weak immune system.</p><p>In general, symptoms may include:</p><div><ul><li>Sore throat</li><li>Fever</li><li>Runny or stuffy nose</li><li>Chest pain, shortness of breath, <a test="test" href="./003070.htm">wheezing</a></li><li>Cough or croup</li></ul></div></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Exams and Tests</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>A physical exam may show sinus tenderness, swollen glands, and a red throat. The health care provider will listen to the lungs and chest with a stethoscope. Abnormal sounds, such as crackling or wheezing, may be heard.</p><p>Tests that may be done include:</p><ul><li><a test="test" href="./003855.htm">Arterial blood gases</a></li><li><a test="test" href="./003744.htm">Blood cultures</a> (to rule out other causes of pneumonia)</li><li><a test="test" href="./003804.htm">Chest x-ray</a></li><li><a test="test" href="./003788.htm">CT scan of the chest</a></li><li><a test="test" href="./003642.htm">Complete blood count (CBC)</a></li><li>Swab of nose for rapid viral test including the virus that causes COVID-19</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Treatment</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>There is no specific treatment for the viral infection. Certain treatments are available for the symptoms of croup and bronchiolitis to make breathing easier. </p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Outlook (Prognosis)</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Most infections in adults and older children are mild and recovery takes place without treatment, unless the person is very old or has an abnormal immune system. Medical intervention may be necessary if <a test="test" href="./003075.htm">breathing difficulties</a> develop.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Possible Complications</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>Secondary bacterial infections are the most common complication. <a test="test" href="./003075.htm">Airway obstruction</a> in croup and bronchiolitis can be severe and even life threatening, especially in younger children.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>When to Contact a Medical Professional</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>Contact your provider if:</p><ul><li>You or your child develops croup, wheezing, or any other type of breathing difficulty.</li><li>A child under 18 months develops any type of upper respiratory symptom.</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Prevention</h2></div><div class="section-button"><button type="submit" aria-controls="section-8" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-8"><p>There are no vaccines available for parainfluenza. A few preventive measures that may help include:</p><ul><li>Avoid crowds to limit exposure during peak outbreaks.</li><li>Wash your hands often.</li><li>Limit exposure to day care centers and nurseries, if possible.</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Human parainfluenza virus; HPIVs </p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Ison MG. Parainfluenza viruses. In: Bennett JE, Dolin R, Blaser MJ, eds. <em>Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases</em>. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 156.</p><p>Weinberg GA, Edwards KM. Parainfluenza viral disease. In: Goldman L, Schafer AI, eds. <em>Goldman-Cecil Medicine</em>. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 339.</p><p>Welliver Sr RC. Parainfluenza viruses. In: Cherry JD, Harrison GJ, Kaplan SL, Steinbach WJ, Hotez PJ, eds. <em>Feigin and Cherry's Textbook of Pediatric Infectious Diseases</em>. 8th ed. Philadelphia, PA: Elsevier; 2019:chap 179.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 7/31/2022</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>Updated by: Denis Hadjiliadis, MD, MHS, Paul F. Harron Jr. Professor of Medicine, Pulmonary, Allergy, and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.</p>
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