Regarding Campylobacter jejuni which is not true?
**Core Concept**
Campylobacter jejuni is a **gram-negative bacterium** commonly associated with **gastroenteritis** in humans. It is a major cause of **diarrheal disease** worldwide. The bacterium's pathogenicity is linked to its ability to invade intestinal epithelial cells.
**Why the Correct Answer is Right**
Since the options are missing, let's focus on general facts about Campylobacter jejuni. It is typically transmitted through **contaminated food** or **water**. The bacteria produce **enterotoxins** and **cytotoxins** that contribute to the disease process.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's challenging to address, but generally, incorrect statements about Campylobacter jejuni might include misconceptions about its transmission or pathogenesis.
**Option B:** Similarly, without the text, we can't directly address, but wrong options might involve incorrect associations with diseases or incorrect descriptions of its bacterial characteristics.
**Option C:** Incorrect statements could involve misunderstandings about the bacterium's virulence factors or its role in diseases beyond gastroenteritis.
**Option D:** This might incorrectly state the bacterium's characteristics, such as being gram-positive or having a different primary mode of transmission.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that Campylobacter jejuni infections can sometimes lead to **Guillain-Barré Syndrome**, a rare but serious autoimmune disorder.
**Correct Answer:** D. It is not true that Campylobacter jejuni is a gram-positive bacterium.