Autoinfection is seen with –
**Core Concept**
Autoinfection refers to the re-infection of an individual by the same infectious agent, where the agent persists within the host's body or environment, facilitating its recurrence. This phenomenon is a critical consideration in the management and control of certain infectious diseases.
**Why the Correct Answer is Right**
Autoinfection is commonly seen with parasites such as hookworms and tapeworms, which can establish chronic infections within the host's gastrointestinal tract. These parasites can lay eggs or segments that are shed into the environment, where they can be ingested by the same individual, leading to re-infection. The lifecycle of these parasites allows them to maintain a reservoir within the host, making autoinfection a significant concern in their management.
**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because autoinfection is not typically associated with bacterial infections such as tuberculosis, which usually require an external source of infection for re-infection to occur.
**Option B:**
This option is incorrect because while certain viral infections such as hepatitis B can cause chronic infections, autoinfection is not a characteristic feature of these infections.
**Option C:**
This option is incorrect because fungal infections such as candidiasis are usually opportunistic and do not exhibit the same level of autoinfection as parasitic infections.
**Clinical Pearl / High-Yield Fact**
It is essential to consider the possibility of autoinfection when managing chronic parasitic infections, as it can impact treatment decisions and prevention strategies.
**Correct Answer:** D.