Question:
A 30-year-old sanitation worker presents with acute onset fever, headache, and muscle aches. He has no prior illnesses. On examination, he is febrile and has redness of the eyes without any discharge. There is no rash, jaundice, or organ involvement.
What is the most appropriate initial treatment?
a. Start IV penicillin G
b. Start IV cefotaxime
c. Give oral levofloxacin
d. Start oral doxycycline
e. Give only symptomatic treatment with analgesics
Answer:
d. Start oral doxycycline
Detailed Explanation:
This is a classic presentation of leptospirosis, a zoonotic infection caused by Leptospira interrogans.
Key diagnostic clues:
- Occupational exposure → sewage worker (high risk due to rat urine exposure)
- Acute febrile illness with myalgia + headache
- Conjunctival suffusion (very characteristic sign; redness without discharge)
- No jaundice, renal failure, or haemodynamic instability → mild disease
Management Logic:
- Mild to moderate leptospirosis → oral doxycycline (first-line)
- Severe leptospirosis (Weil’s disease) → IV benzylpenicillin or ceftriaxone
This patient has no red flags such as:
- Jaundice
- Acute kidney injury
- Bleeding
- Hypotension
Hence, oral doxycycline is sufficient and appropriate
Why other options are wrong:
- IV penicillin G → reserved for severe disease
- IV cefotaxime → also for severe or hospitalized patients
- Oral levofloxacin → not first-line
- Analgesics alone → inadequate (infection needs antibiotics)
Cheat Sheet (Exam-Oriented)
Leptospirosis = Think:
- Sewage worker / farmer / rat exposure
- Fever + myalgia + headache
- Conjunctival suffusion (key sign!)
Disease Phases:
- Septic phase → flu-like illness
- Immune phase → complications
Severe (Weil’s disease):
- Jaundice
- Renal failure
- Haemorrhage
Treatment:
- Mild → oral doxycycline / azithromycin
- Severe → IV benzylpenicillin / ceftriaxone
Flashcards
Q1: What is the hallmark eye sign in leptospirosis?
A: Conjunctival suffusion (red eyes without discharge)
Q2: First-line treatment for mild leptospirosis?
A: Oral doxycycline
Q3: When do you use IV antibiotics in leptospirosis?
A: Severe disease (Weil’s disease)
Q4: Common occupational risk groups?
A: Sewage workers, farmers, vets, abattoir workers
Q5: What organism causes leptospirosis?
A: Leptospira interrogans (spirochaete)
MCQs (High Difficulty)
MCQ 1:
A 35-year-old farmer presents with fever, calf pain, and red eyes without discharge. Which feature most strongly supports leptospirosis over viral illness?
a. Fever
b. Myalgia
c. Conjunctival suffusion
d. Headache
e. Fatigue
Answer: c
Explanation: Conjunctival suffusion is highly characteristic and helps differentiate from viral illnesses.
MCQ 2:
Which of the following is false regarding leptospirosis?
a. It is caused by a spirochaete
b. Transmission occurs via contaminated water
c. Conjunctivitis with purulent discharge is typical
d. Severe disease can cause renal failure
e. Doxycycline is used in mild disease
Answer: c
Explanation: Discharge is absent; suffusion is non-purulent.
MCQ 3:
A patient with leptospirosis develops jaundice and oliguria. Best treatment?
a. Oral doxycycline
b. Oral azithromycin
c. IV benzylpenicillin
d. Oral ciprofloxacin
e. No antibiotics needed
Answer: c
Explanation: Severe disease (Weil’s) → IV penicillin.
MCQ 4:
Which phase of leptospirosis is associated with immune-mediated complications?
a. Incubation phase
b. Septicemic phase
c. Immune phase
d. Chronic phase
e. Latent phase
Answer: c
Explanation: Immune phase causes meningitis, organ dysfunction.
MCQ 5:
Which investigation becomes positive earliest in leptospirosis?
a. Urine culture
b. Serology
c. Blood PCR
d. Stool culture
e. Liver biopsy
Answer: c
Explanation: PCR detects early bacteremia; antibodies take ~7 days.
Summary for Quick Exam Revision
Leptospirosis is a zoonotic infection caused by Leptospira interrogans, commonly transmitted via exposure to water contaminated with rat urine, making occupations like sewage workers and farmers high risk. It typically presents as an acute febrile illness with headache, myalgia, and the characteristic conjunctival suffusion, which is redness of the eyes without discharge and serves as a key diagnostic clue. The disease progresses in two phases: an initial septicemic phase followed by an immune phase, which may lead to complications. Severe leptospirosis, known as Weil’s disease, is marked by jaundice, renal failure, and haemorrhage. Diagnosis is supported by PCR early in the disease and serology later. Management depends on severity: mild to moderate cases are treated with oral doxycycline or azithromycin, while severe cases require intravenous benzylpenicillin or ceftriaxone. Early antibiotic therapy is crucial to prevent complications, and symptomatic treatment alone is insufficient.