Weil Syndrome

National Organization for Rare Disorders, Inc.

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It is possible that the main title of the report Weil Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.


  • Fiedler Disease
  • Icterohemorrhagic Leptospirosis
  • Infectious Jaundice
  • Lancereaux-Mathieu-Weil Spirochetosis
  • Leptospiral Jaundice
  • Spirochetal Jaundice
  • Weil Disease
  • Icteric Leptospirosis

Disorder Subdivisions

  • None

General Discussion

Weil syndrome, a rare infectious disorder, is a severe form of the bacterial infection caused by Leptospira bacteria known as leptospirosis. Weil syndrome is characterized by dysfunction of the kidneys and liver, abnormal enlargement of the liver (hepatomegaly), persistent yellowing of the skin, mucous membranes, and whites of the eyes (jaundice), and/or alterations in consciousness. In most cases, Weil syndrome occurs among individuals who are exposed to affected animals.


Symptoms of Weil syndrome usually start abruptly, with headache, disturbances in consciousness, pain in muscles and abdomen, a stiff neck, lack of appetite (anorexia), chills, nausea, vomiting, and fever. Prostration, coughing, expectoration of blood-stained sputum (hemoptysis), and nosebleed (epistaxis) may also occur. Yellowing of the skin (jaundice), bleeding in muscles, gastrointestinal tract, and visceral organs may be widespread. Small purplish-red spots (petechiae) may appear, caused by hemorrhages in the skin. Enlarged lymph nodes, and continued fever may occur for several days. Respiratory distress syndrome which includes great difficulty breathing and dangerously low levels of oxygen in the blood (hypoxemia) may sometimes develop in Weil syndrome.

Signs of liver and kidney dysfunction usually appear from the 3rd to the 6th day. Kidney abnormalities may include the appearance of protein (proteinuria), pus (pyuria), or blood in the urine (hematuria), and an excess of urea in the blood (azotemia). The kidney is often enlarged, and its capsule is tense. Bleeding in many places throughout the body may occur due to injury of tiny blood vessels (capillaries). A low number of blood platelets (thrombocytopenia) may also occur. Damage to the liver is usually minimal and complete healing almost always occurs. Fever usually abates on the 7th day, but it may be recurrent for weeks. After age 50 the prognosis for Weil syndrome is less optimistic than for younger people.


Weil syndrome is caused by an infection from the bacteria Leptospira icterohemorrhagiae or other related types of this bacteria (such as L canicola, or L pomona). The infection is usually transferred to humans through urine or tissue of an infected domestic or wild animal. The infection enters through a skin abrasion or the mucous membranes.

Affected Populations

Weil syndrome may occur in people of all ages. At least 75% of persons infected with this disorder are male. It can be an occupational disorder striking farmers, veterinarians, or sewer and abattoir workers, but most patients are exposed incidentally during recreational activities.

Standard Therapies


The results of various laboratory tests, including blood and urine tests, assist in the diagnosis.


If begun in the first three or four days after the onset of symptoms, the intravenous administration of antibiotics may be effective. Peritoneal dialysis in combination with antibiotics has been used successfully in some patients.

Investigational Therapies

Information on current clinical trials is posted on the Internet at www.clinicaltrials.gov. All studies receiving U.S. government funding, and some supported by private industry, are posted on this government web site.

For information about clinical trials being conducted at the NIH Clinical Center in Bethesda, MD, contact the NIH Patient Recruitment Office:

Tollfree: (800) 411-1222

TTY: (866) 411-1010

Email: prpl@cc.nih.gov

For information about clinical trials sponsored by private sources, contact:




Beers MH, Berkow R., eds. The Merck Manual, 17th ed. Whitehouse Station, NJ: Merck Research Laboratories; 1999:1188.

Berkow R., ed. The Merck Manual-Home Edition.2nd ed. Whitehouse Station, NJ: Merck Research Laboratories; 2003:1104.

Gorbach SL, Bartlett JG, Blacklow NR. Eds. Infectious Diseases. W.B. Saunders Company, Philadelphia, PA; 1992:1297-99.

Mandell GL, Bennett JE, Dolan R. Eds. Mandell, Douglas and Bennett's Principles and Practice of Infectious Diseases. 4th ed. Churchill Livingstone Inc. New York, NY; 1995:2138.


Yiu MW, Ooi GC, Yuen KY, et al. High resolution CT of Weil's disease. Lancet. 2003;362:117.

Pea L, Roda L, Boussaud V, et al. Desmopressin therapy for massive hemoptysis associated with severe leptospirosis. Am J Respir Crit Care Med. 2003;167:726-28.

Kishor KK, Rao PV, Bhat KR, et al. Pancreatitis in Weil's disease. Trop Doct. 2002;32:230-31.

Murali KV, Sujay R, Pavithran S, et al. Intracranial bleeding in Weil's disease. J Postgrad Med. 2002;48:158.

Aoki T, Koizumi N, Watanabe H. A case of leptospirosis probably caused by drinking contaminated well-water after an earthquake. Jpn J Infect Dis. 2001;54:243-44.


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For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders, Inc.® (NORD). Cigna members can access the complete report by logging into myCigna.com. For non-Cigna members, a copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see http://www.rarediseases.org/search/rdblist.html.