**Core Concept**
Calciviruses are a family of viruses that belong to the Caliciviridae family. They are known to cause gastrointestinal infections in humans, including norovirus, which is responsible for a significant number of foodborne and waterborne illnesses worldwide.
**Why the Correct Answer is Right**
Norovirus, a member of the Calciviridae family, is a major cause of gastroenteritis in humans. It is highly contagious and can spread through contaminated food, water, and surfaces. The virus binds to the histo-blood group antigen (HBGA) on the surface of intestinal epithelial cells, leading to cell death and diarrhea. Norovirus infection is often self-limiting, but it can be severe in certain populations, such as the elderly and young children.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a virus that belongs to the Calciviridae family.
**Option B:** This option is incorrect because it does not accurately describe a member of the Calciviridae family.
**Option C:** This option is incorrect because it does not specify a virus that is known to cause gastrointestinal infections in humans.
**Clinical Pearl / High-Yield Fact**
Norovirus is highly contagious and can spread through contaminated food, water, and surfaces, making it a significant public health concern. Good hygiene practices, such as frequent handwashing and proper disposal of waste, can help prevent the spread of norovirus.
**Correct Answer:** D.
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