Human is the only reservoir for
**Core Concept**
Diseases that are zoonotic, meaning they can be transmitted from animals to humans, often have specific reservoirs where the pathogen multiplies and is maintained. Understanding the reservoir for a particular disease is crucial for disease control and prevention.
**Why the Correct Answer is Right**
The correct answer is related to the disease caused by the rabies virus. Human beings are not the primary reservoir for rabies, but they can be infected through bites from infected animals, usually dogs, cats, or bats. The rabies virus primarily multiplies in the salivary glands of infected animals and is transmitted to humans through the saliva of the infected animal during a bite.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because the rabies virus primarily infects mammals, not birds.
**Option B:** Incorrect because the rabies virus is not typically associated with rodents or other small mammals.
**Option C:** Incorrect because the rabies virus is not primarily found in reptiles or amphibians.
**Clinical Pearl / High-Yield Fact**
The primary reservoir for rabies is often the domestic dog, which is responsible for the majority of human rabies deaths worldwide. This highlights the importance of animal vaccination and control programs in preventing the spread of rabies.
**Correct Answer: D. Rabies virus.