Leptospirosis
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Definition
Infection caused by Leptospira interrogans.
Epidemiology
Pretty rare, but worth knowing about.
Pathophysiology
Passed in urine of small mammals, so generally comes from swimming or working in fresh water. Classic history, someone will be swimming, sailing or canoeing in a lake, a week later gets ill.
Clinical Features
Two phases:
Acute phase
- Classic acute viral infection
- Fever
- Joint pain
- Headache
Second phase
Also known as Weil's disease, this is much more serious. Approximately 5-10% of acute go on to get this.
Investigations
Leptospires seen on dark ground microscopy of blood.
Management
Doxycycline and Benzylpenicillin
Prognosis
Treated early, most respond well. Obviously, if you have renal failure, liver failure, meningitis and you are bleeding out of your eyes, things are looking less good.