Leptospirosis

Area of Science:

• Bacteriology
• Infectious Diseases
• Immunology

Background:

• Leptospirosis is a widespread zoonotic bacterial infection caused by *Leptospira* species.
• Annual global estimates suggest one million cases and approximately 60,000 deaths.
• Severe leptospirosis pathogenesis involves host genetics, pathogen virulence, and immune dysregulation, leading to cytokine storms and immunoparesis.

Purpose of the Study:

• To review the current understanding of leptospirosis, including its epidemiology, pathogenesis, treatment, and prevention.
• To highlight knowledge gaps and propose future research directions for leptospirosis control.

Main Methods:

• Literature review of leptospirosis epidemiology, clinical presentation, and treatment strategies.
• Analysis of current diagnostic and therapeutic limitations.
• Identification of areas requiring further scientific investigation.

Main Results:

• *Leptospira* are treatable with antibiotics in early infection, but late-stage disease with organ dysfunction relies on supportive care.
• Existing vaccines offer limited protection, primarily against rodent-associated serogroups.
• Effective prevention relies on behavioral changes and personal protective measures, with prophylactic antibiotic efficacy unconfirmed.

Conclusions:

• Accurate global disease burden estimation, understanding severe leptospirosis pathophysiology, and developing point-of-care diagnostics are critical research priorities.
• Targeted immunotherapies and vaccines require further research informed by pathophysiology insights.
• Improved prevention and treatment strategies are needed to combat this significant global health threat.