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</div><div><span>Dengue fever</span></div></div>
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</noscript></div><div class="main"><div id="ency_summary"><p>Dengue fever is a virus-caused disease that is spread by mosquitoes. Dengue in its mild form causes fever and a rash and lasts about a week. Severe dengue can cause shock, internal bleeding, and death. About 1 out of 20 people with dengue will develop severe dengue within a few hours after symptoms start. The main risk factor for severe dengue is a prior infection with dengue.</p><img title="Dengue fever" alt="Dengue fever" src="//medlineplus.gov/ency/images/ency/fullsize/17148.jpg" class="img-e" itemprop="image"/></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>Dengue fever is caused by 1 of 4 different but related viruses. It is spread by the bite of mosquitoes, most commonly the mosquito <em>Aedes aegypti</em>, which is found in tropic and subtropic regions. This area includes parts of:</p><ul><li>The Indonesian archipelago into northeastern Australia</li><li>South and Central America</li><li>Southeast Asia</li><li>Sub-Saharan Africa</li><li>The Caribbean (including Puerto Rico and US Virgin Islands) </li></ul><p>Dengue fever is rare in the US mainland, but has been found in Hawaii, Florida, and Texas. Since 2022, dengue has also been reported in California and Arizona.</p><p>Many cases in the United States occur when someone travels to an area where dengue is present and returns home with the illness. Dengue cannot spread from human to human.</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>Dengue fever begins with a sudden high fever, often as high as 105°F (40.5°C), 4 to 7 days after the infection.</p><p>A flat, red rash may appear over most of the body 2 to 5 days after the fever starts. A second rash, which looks like the <a test="test" href="./001569.htm">measles</a>, appears later in the disease. Infected people may have increased skin sensitivity and are very uncomfortable.</p><p>Other symptoms include:</p><ul><li>Fatigue</li><li>Headache (especially behind the eyes)</li><li><a test="test" href="./003261.htm">Joint aches</a> (often severe)</li><li><a test="test" href="./003178.htm">Muscle aches</a> (often severe)</li><li>Nausea and vomiting</li><li>Swollen lymph nodes</li><li>Cough</li><li>Sore throat</li><li>Nasal stuffiness</li></ul><p>Symptoms of severe dengue can occur 24 to 48 hours after fever has gone away. Severe symptoms include:</p><ul><li>Severe stomach pain and tenderness</li><li>Vomiting often (at least 3 times in 24 hours)</li><li>Bleeding from the nose or gums</li><li>Vomiting blood or passing blood in the stools or urine</li><li>Bleeding under the skin (looks like bruises)</li><li>Difficulty breathing, rapid breathing</li><li>Feeling tired, restless, or irritable</li></ul><p>If you or anyone you know has symptoms of severe dengue, call 911 or the local emergency number right away.</p></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>Tests that may be done to diagnose this condition include:</p><ul><li><a test="test" href="./003333.htm">Antibody titer</a> for dengue virus types</li><li>Complete blood count (<a test="test" href="./003642.htm">CBC</a>)</li><li>Polymerase chain reaction (PCR) test for dengue virus types</li><li><a test="test" href="./003436.htm">Liver function tests</a></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 dengue fever. Fluids are given if there are signs of <a test="test" href="./000982.htm">dehydration</a>. Acetaminophen (Tylenol) is used to treat a high fever. </p><p>Avoid taking aspirin, ibuprofen (Advil, Motrin), and naproxen (Aleve). They may increase bleeding problems.</p><p>Severe dengue is a medical emergency. It must be treated immediately at a hospital. Treatment for severe dengue is supportive and may include:</p><ul><li>Fluids given through a vein (IV)</li><li>Oxygen</li><li>Blood pressure management</li><li>Blood transfusions</li></ul></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>Mild cases of dengue generally last a week or more. Although uncomfortable, mild dengue fever is not deadly. People with the condition should fully recover. In some Latin American and Asian countries, severe dengue is a leading cause of death and severe illness. Early detection and treatment of severe dengue can greatly reduce the risk of death.</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>Untreated, dengue fever may cause the following health problems:</p><ul><li>Febrile <a test="test" href="./000980.htm">convulsions</a></li><li>Severe dehydration</li><li>Death</li></ul></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 health care provider if you have traveled in an area where dengue fever is known to occur and you have symptoms of the disease.</p></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>To prevent dengue, take steps to prevent mosquito bites:</p><ul><li>Use insect repellent daily and reapply as needed.</li><li>Wear loose-fitting, long-sleeved shirts and pants.</li><li>Spray clothing and hats with permethrin (an insecticide that repels mosquitos), but do not apply to skin.</li><li>Sleep under mosquito netting if sleeping outside or if there are no screens on windows.</li><li>Limit outdoor activity during mosquito season, especially when they are most active, at dawn and dusk.</li></ul><p>When traveling, check to see if dengue is present in the area you will be traveling. Bring protective clothing, mosquito repellent, and netting if needed.</p></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>O'nyong-nyong fever; Dengue-like disease; Breakbone fever; Dengue hemorrhagic fever</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/1246t.jpg" alt="Mosquito, adult feeding on the skin" title="Mosquito, adult feeding on the skin" class="side-img"/><a href="../imagepages/1246.htm">Mosquito, adult feeding on the skin</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/17148t.jpg" alt="Dengue fever" title="Dengue fever" class="side-img"/><a href="../imagepages/17148.htm">Dengue fever</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/1247t.jpg" alt="Mosquito, adult" title="Mosquito, adult" class="side-img"/><a href="../imagepages/1247.htm">Mosquito, adult</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/1248t.jpg" alt="Mosquito egg raft" title="Mosquito egg raft" class="side-img"/><a href="../imagepages/1248.htm">Mosquito, egg raft</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/1249t.jpg" alt="Mosquito - larvae" title="Mosquito - larvae" class="side-img"/><a href="../imagepages/1249.htm">Mosquito - larvae</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/1250t.jpg" alt="Mosquito, pupa" title="Mosquito, pupa" class="side-img"/><a href="../imagepages/1250.htm">Mosquito, pupa</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/9069t.jpg" alt="Antibodies" title="Antibodies" class="side-img"/><a href="../imagepages/9069.htm">Antibodies</a></li>
</ul></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>Centers for Disease Control and Prevention website. About dengue. <a href="https://www.cdc.gov/dengue/about/index.html" target="_blank">www.cdc.gov/dengue/about/index.html</a>.  Updated May 14, 2024. Accessed August 22, 2024.</p><p>Endy TP. Viral febrile illnesses and emerging pathogens. In: Ryan ET, Hill DR, Solomon T, Aronson NE, Endy TP, eds. <em>Hunter's Tropical Medicine and Infectious Disease</em>. 10th ed. Philadelphia, PA: Elsevier; 2020:chap 36.</p><p>Thomas SJ, Endy TP, Rothman AL, Barrett AD. Flaviviruses (dengue, yellow fever, Japanese encephalitis, West Nile encephalitis, Usutu encephalitis, St. Louis encephalitis, tick-borne encephalitis, Kyasanur forest disease, Alkhurma hemorrhagic fever, Zika). 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 153.</p><p>World Health Organization website. Dengue and severe dengue. <a href="https://www.who.int/news-room/fact-sheets/detail/dengue-and-severe-dengue" target="_blank">www.who.int/news-room/fact-sheets/detail/dengue-and-severe-dengue</a>. Updated April 23, 2024. Accessed August 22, 2024.</p></div></div></section>
<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 12/4/2022</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: Jatin M. Vyas, MD, PhD, Associate Professor in Medicine, Harvard Medical School; Associate in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. Editorial update 08/22/2024. </p>
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