**Core Concept**
Leptospirosis is a zoonotic bacterial infection caused by Leptospira species, transmitted through contact with contaminated water or soil. It presents with a wide range of symptoms, including fever, jaundice, and renal failure, reflecting its impact on multiple organ systems.

**Why the Correct Answer is Right**
Leptospirosis is a classic occupational hazard for sewerage workers, as they are exposed to contaminated water and soil. The bacteria infect the liver, kidneys, and other organs, leading to elevated hepatic enzymes and renal failure. The presence of conjunctivitis is also consistent with leptospirosis, as the bacteria can cause uveitis and conjunctival inflammation. The incubation period of 5-14 days, during which the worker would have been exposed to contaminated water, supports this diagnosis.

**Option A:** Malaria is caused by Plasmodium species and primarily presents with fever, chills, and anemia, without the characteristic jaundice and renal failure seen in leptospirosis.
**Option C:** Pertussis (whooping cough) is caused by Bordetella pertussis and presents with a characteristic cough, not the symptoms described in this case.
**Option D:** Typhoid fever is caused by Salmonella Typhi and presents with fever, abdominal pain, and diarrhea, without the renal failure and jaundice seen in leptospirosis.

**Clinical Pearl / High-Yield Fact**
Leptospirosis is often referred to as "weil's disease" due to the classic triad of symptoms: jaundice, renal failure, and hemorrhagic pneumonitis. This mnemonic can help you remember the key features of this condition.

**✓ Correct Answer: B. Leptospirosis**