[Leptospirosis].

Area of Science:

• Infectious Diseases
• Zoonoses
• Microbiology

Background:

• Leptospirosis is a significant global anthropozoonosis with 1 million cases yearly, prevalent in tropical regions but also found in temperate zones.
• In France, high-risk groups include freshwater athletes and agricultural workers, with incidence peaking in late summer.
• Infection occurs via Leptospira penetration through skin or mucous membranes, leading to direct tissue damage or indirect injury.

Purpose of the Study:

• To provide a comprehensive overview of Leptospirosis, covering its epidemiology, clinical manifestations, diagnostic methods, and treatment.
• To highlight the variability in clinical presentation, from mild flu-like illness to severe septic shock.
• To discuss diagnostic challenges and the role of serology and PCR.

Main Methods:

• Review of clinical and epidemiological data on Leptospirosis.
• Description of diagnostic techniques including serology (micro-agglutination test) and PCR.
• Discussion of clinical findings and laboratory results.

Main Results:

• Clinical presentation ranges from flu-like symptoms to multi-organ dysfunction syndrome, with fever, headache, and myalgia being common.
• Key biological findings include thrombocytopenia, lymphopenia, cholestasis, elevated liver enzymes, renal failure, hematuria, and proteinuria.
• Mortality is rare with adequate therapy for organ failures such as renal failure and pulmonary edema.

Conclusions:

• Leptospirosis diagnosis requires careful consideration, as initial negative serology does not rule out the disease.
• Prompt and adequate medical therapy is essential for managing organ failures and improving patient outcomes.
• While a vaccine exists for one serogroup, its use is recommended for occupational exposure, with no consensus for leisure activities.