During a leptospirosis outbreak investigation in a coastal city, the public health team identifies the most common occupational group at risk. Which occupation is most commonly associated with leptospirosis in endemic areas?

Explanation

## Occupational Risk Groups for Leptospirosis **Key Point:** Sewage workers, plumbers, and other occupations involving contact with contaminated water are at highest risk for leptospirosis due to direct exposure to rat-urine-contaminated sewage and stagnant water. ### High-Risk Occupational Groups | Occupation | Exposure Route | Risk Level | Geographic Context | |-----------|----------------|-----------|-------------------| | Sewage workers / plumbers | Direct contact with contaminated sewage | **Very High** | Urban and periurban areas | | Rice field farmers | Wading in flooded fields during monsoon | High | Agricultural regions | | Slaughterhouse workers | Contact with infected animal tissues | High | Industrial settings | | Mine workers | Exposure to rat-infested underground water | High | Mining areas | | School teachers | Minimal occupational exposure | Low | Community setting | | Office administrators | No occupational exposure | Very Low | Indoor office environment | | Retail shopkeepers | Minimal exposure | Very Low | Retail environment | **High-Yield:** Sewage workers represent the single largest occupational cohort affected by leptospirosis in urban endemic areas because they have continuous, direct contact with rat urine in sewage systems. **Clinical Pearl:** The biphasic presentation in sewage workers often goes unrecognized initially because fever and myalgia are attributed to occupational fatigue; the second immune phase with jaundice and renal involvement prompts diagnosis. ### Transmission Mechanism in Sewage Workers 1. **Rat colonization:** Sewage systems provide ideal habitat (moisture, food, shelter) 2. **Chronic shedding:** Infected rats shed leptospires continuously in urine 3. **Occupational exposure:** Skin abrasions, mucous membrane contact during work 4. **Seasonal peaks:** Monsoon flooding increases sewage overflow and rat activity **Mnemonic:** **SEWAGE = Highest Leptospirosis Risk** — Sewage workers have the most direct, frequent contact with rat-contaminated water. [cite:Park 26e Ch 18]