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</div><div><span>Rocky Mountain spotted fever</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">Rocky Mountain spotted fever</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Rocky Mountain spotted fever (RMSF) is a disease caused by a type of bacteria carried by ticks.</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>RMSF is caused by the bacterium <em>Rickettsia rickettsii (R Rickettsii)</em>, which is carried by ticks. The bacteria is spread to humans through a <a test="test" href="./002856.htm">tick</a> bite.</p><p>In the western United States, the bacteria are carried by the wood tick. In the eastern US, they are carried by the dog tick. Other ticks spread the infection in the southern US and in Central and South America.</p><p>Contrary to the name "Rocky Mountain," most recent cases have been reported in the eastern US. States include North and South Carolina, Virginia, Georgia, Tennessee, and Oklahoma. Most cases occur in the spring and summer and are found in children.</p><p>Risk factors include recent hiking or exposure to ticks in an area where the disease is known to occur. The bacteria are unlikely to be transmitted to a person by a tick that has been attached for less than 20 hours. Only about 1 in 1,000 ticks carry the bacteria. Bacteria can also infect people who crush ticks they have removed from pets with their bare fingers. Not all people will remember getting a tick bite.</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 usually develop about 2 to 14 days after the tick bite. They may include:</p><ul><li>Chills and fever</li><li>Confusion</li><li>Headache</li><li>Muscle pain</li><li>Rash -- usually starts a few days after the fever; first appears on wrists and ankles as spots that are 1 to 5 mm in diameter, then spreads to most of the body. Some infected people don't get a rash.</li></ul><p>Other symptoms that may occur with this disease:</p><ul><li><a test="test" href="./003126.htm">Diarrhea</a></li><li><a test="test" href="./003041.htm">Light sensitivity</a></li><li><a test="test" href="./003258.htm">Hallucinations</a></li><li><a test="test" href="./003121.htm">Loss of appetite</a></li><li><a test="test" href="./003117.htm">Nausea and vomiting</a></li><li><a test="test" href="./003120.htm">Abdominal pain</a></li><li><a test="test" href="./003085.htm">Thirst</a></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>Your health care provider will perform a physical examination and ask about your symptoms.</p><p>Tests that may be done include:</p><ul><li><a test="test" href="./003333.htm">Antibody titer</a> by <a test="test" href="./003456.htm">complement</a> fixation or immunofluorescence</li><li><a test="test" href="./003642.htm">Complete blood count</a> (CBC)</li><li><a test="test" href="./003435.htm">Kidney function tests</a></li><li><a test="test" href="./003653.htm">Partial thromboplastin time (PTT)</a></li><li><a test="test" href="./003652.htm">Prothrombin time (PT)</a></li><li>Skin biopsy taken from the rash to check for <em>R. rickettsii</em></li><li>Urinalysis to check for <a test="test" href="./003138.htm">blood</a> or <a test="test" href="./003580.htm">protein in the urine</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>Treatment involves antibiotics and carefully removing the tick from the skin. To get rid of the infection, antibiotics such as doxycycline or tetracycline need to be taken. Pregnant women are usually prescribed chloramphenicol.</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>Treatment usually cures the infection. About 3% of people who get this disease will die.</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, the infection may lead to health problems such as:</p><ul><li>Brain damage</li><li>Clotting problems</li><li>Heart failure</li><li>Kidney failure</li><li>Lung failure</li><li><a test="test" href="./000680.htm">Meningitis</a></li><li>Pneumonitis (lung inflammation)</li><li>Shock</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 if you develop symptoms after exposure to ticks or a tick bite. The complications of untreated RMSF are often life threatening.</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>When walking or hiking in tick-infested areas, tuck long pants into socks to protect the legs. Wear shoes and long-sleeved shirts. Ticks will show up on white or light colors better than on dark colors, making them easier to see and remove.</p><p>Remove ticks immediately by using tweezers, pulling carefully and steadily. Insect repellent may be helpful. Because only about 1 in 1,000 ticks carry this infection, antibiotics are not usually given after a tick bite.</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>Spotted 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/1014t.jpg" alt="Rocky mountain spotted fever, lesions on arm" title="Rocky mountain spotted fever, lesions on arm" class="side-img"/><a href="../imagepages/1014.htm">Rocky mountain spotted fever - lesions on arm</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/1119t.jpg" alt="Deer ticks" title="Deer ticks" class="side-img"/><a href="../imagepages/1119.htm">Deer ticks</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/1307t.jpg" alt="Rocky mountain spotted fever on the arm" title="Rocky mountain spotted fever on the arm" class="side-img"/><a href="../imagepages/1307.htm">Rocky mountain spotted fever on the arm</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>Blanton LS, Walker DH. <em>Rickettsia rickettsii</em> and other spotted fever group rickettsiae (Rocky Mountain spotted fever and other spotted fevers). 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 186.</p><p>Bolgiano EB, Sexton J. Tickborne illnesses. In: Walls RM, ed. <em>Rosen's Emergency Medicine: Concepts and Clinical Practice</em>. 10th ed. Philadelphia, PA: Elsevier; 2023:chap 123.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 5/19/2023</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. </p>
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