Question:
Several residents in a village develop watery followed by bloody diarrhea after consuming unpasteurized milk. Stool microscopy reveals Gram-negative curved bacilli with polymorphonuclear leukocytes. Identify the most likely pathogen.
Several residents in a village develop watery followed by bloody diarrhea after consuming unpasteurized milk. Stool microscopy reveals Gram-negative curved bacilli with polymorphonuclear leukocytes. Identify the most likely pathogen.
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Unpasteurized milk + bloody diarrhea + curved Gram-negative bacilli = Campylobacter jejuni.
Updated On: May 14, 2026
- Clostridium perfringens
- Staphylococcus aureus
- Vibrio parahaemolyticus
- Campylobacter jejuni
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The Correct Option is D
Solution and Explanation
Concept:
Campylobacter jejuni causes inflammatory diarrhea, often after ingestion of contaminated food or unpasteurized milk. It is a Gram-negative curved or comma-shaped bacillus.
Step 1: Identify exposure.
The outbreak occurred after consuming: \[ \text{Unpasteurized milk} \]
Step 2: Identify stool findings.
Gram-negative curved bacilli with polymorphonuclear leukocytes indicate invasive inflammatory diarrhea.
Step 3: Choose pathogen.
The most likely pathogen is: \[ \textit{Campylobacter jejuni} \]
Step 1: Identify exposure.
The outbreak occurred after consuming: \[ \text{Unpasteurized milk} \]
Step 2: Identify stool findings.
Gram-negative curved bacilli with polymorphonuclear leukocytes indicate invasive inflammatory diarrhea.
Step 3: Choose pathogen.
The most likely pathogen is: \[ \textit{Campylobacter jejuni} \]
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