**Campylobacter jejuni**

### Core Concept

Campylobacter jejuni is a Gram-negative, spiral-shaped bacterium that is a leading cause of bacterial gastroenteritis worldwide. It primarily infects the small intestine and is commonly associated with the consumption of contaminated food and water, particularly undercooked poultry and unpasteurized dairy products.

### Why the Correct Answer is Right

Campylobacter jejuni infection typically presents with symptoms such as diarrhea, abdominal cramps, fever, and vomiting, usually within 2-5 days of exposure. The pathogenesis of C. jejuni involves its ability to adhere to and invade the intestinal epithelial cells, leading to inflammation and disruption of the intestinal barrier. The bacterium also produces toxins that contribute to the development of symptoms.

### Why Each Wrong Option is Incorrect

**Option A:** This option is incorrect as C. jejuni is indeed a zoonotic pathogen, meaning it can be transmitted from animals to humans. It is commonly found in poultry and cattle.

**Option B:** This option is incorrect as C. jejuni does not typically cause a rash or skin lesions. While some patients may experience a rash, it is not a characteristic feature of C. jejuni infection.

**Option C:** This option is incorrect as C. jejuni is not typically associated with a prolonged incubation period. Symptoms usually develop within 2-5 days of exposure.

### Clinical Pearl / High-Yield Fact

It's essential to note that Campylobacter jejuni is a leading cause of Guillain-Barré syndrome, a rare autoimmune disorder that can occur weeks after a C. jejuni infection. This association highlights the importance of prompt diagnosis and treatment of C. jejuni infection.

### Correct Answer: D