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</div><div><span>Chagas disease</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">Chagas disease</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Chagas disease is an illness caused by tiny parasites and spread by insects. The disease is common in South and Central America.</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>Chagas disease is caused by the parasite <em>Trypanosoma cruzi. </em>It is spread by the bite of reduviid bugs, or kissing bugs, and is one of the major health problems in South America. Due to immigration, the disease also affects people in the United States.</p><p>Risk factors for Chagas disease include:</p><ul><li>Living in a hut where reduviid bugs live in the walls</li><li>Living in Central or South America</li><li>Poverty</li><li>Receiving a blood transfusion or an organ donation from a person who carries the parasite, but does not have active Chagas disease</li></ul></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>Chagas disease has two phases: <a test="test" href="./002215.htm">acute</a> and <a test="test" href="./002312.htm">chronic</a>. The acute phase may have no symptoms or very mild symptoms, including:</p><ul><li>Fever</li><li>General ill feeling</li><li>Swelling of an eye if the bite is near the eye</li><li>Swollen red area at site of the insect bite</li></ul><p>After the acute phase, the disease goes into remission. No other symptoms may appear for many years. When symptoms finally develop, they may include:</p><ul><li>
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Constipation
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</li><li>Digestive problems</li><li>Heart failure</li><li>Pain in the abdomen</li><li>Pounding or racing heart</li><li>Swallowing difficulties</li></ul></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 test="test" href="./002274.htm">Physical examination</a> can confirm the symptoms. Signs of Chagas disease may include:</p><ul><li>Disease of the heart muscle</li><li>Enlarged liver and spleen</li><li><a test="test" href="./003097.htm">Enlarged lymph nodes</a></li><li>Irregular heartbeat</li><li>Rapid heartbeat </li></ul><p>Tests include:</p><ul><li><a test="test" href="./003744.htm">Blood culture</a> to look for signs of infection</li><li><a test="test" href="./003804.htm">Chest x-ray</a></li><li><a test="test" href="./003869.htm">Echocardiogram</a> (uses sound waves to create pictures of the heart)</li><li>Electrocardiogram (<a test="test" href="./003868.htm">ECG</a>, tests electrical activity in the heart)</li><li>Enzyme-linked immunoassay (<a test="test" href="./003332.htm">ELISA</a>) to look for signs of infection</li><li><a test="test" href="./003665.htm">Blood smear</a> to look for signs of infection </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>The acute phase of reactivated Chagas disease should be treated. Infants born with the infection should also be treated.</p><p>Treating the chronic phase is recommended for children and most adults. Adults with chronic phase Chagas disease should talk to their health care provider to decide whether treatment is needed.</p><p>Two drugs are used to treat this infection: benznidazole and nifurtimox.</p><p>Both drugs often have side effects. The side effects may be worse in older people. They may include:</p><ul><li>Headaches and dizziness</li><li>Loss of appetite and weight loss</li><li>Nerve damage</li><li>Problems sleeping</li><li>Skin rashes</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>About one third of infected people who are not treated will develop chronic or <a test="test" href="./002293.htm">symptomatic</a> Chagas disease. It may take more than 20 years from the time of the original infection to develop heart or digestive problems.</p><p>Abnormal heart rhythms may cause sudden death. Once heart failure develops, death usually occurs within several years.</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>Chagas disease can cause these complications:</p><ul><li>Enlarged colon</li><li>Enlarged esophagus with swallowing difficulty</li><li>
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Heart disease
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</li><li>Heart failure</li><li><a test="test" href="./000404.htm">Malnutrition</a></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 provider for an appointment if you think you may have Chagas 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>Insect control with insecticides and houses that are less likely to have high insect populations will help control the spread of the disease.</p><p>Blood banks in Central and South America screen donors for exposure to the parasite. The blood is discarded if the donor has the parasite. Most blood banks in the United States began screening for Chagas disease in 2007.</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>Parasite infection - American trypanosomiasis</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/1244t.jpg" alt="Kissing bug" title="Kissing bug" class="side-img"/><a href="../imagepages/1244.htm">Kissing bug</a></li>
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</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>Kirchhoff LV. <em>Trypanosoma</em> species (American trypanosomiasis, Chagas' disease): biology of trypanosomes. 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 276.</p><p>Salvana EMT, Salata RA. American Trypanosomiasis (Chagas Disease; <em>Trypanosoma cruzi</em>). In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. <em>Nelson Textbook of Pediatrics</em>. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 313.</p></div></div></section>
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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.</p>
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