Rhabditiform larvae in freshly passed stools are seen with –
**Core Concept**
The question is testing the ability to identify the stage of a specific parasite's life cycle that can be found in freshly passed stools. Rhabditiform larvae are the first stage of a parasitic nematode's life cycle, which is typically found in the environment or in the gastrointestinal tract of a host.
**Why the Correct Answer is Right**
Rhabditiform larvae are the first-stage larvae of various nematodes, including hookworms and Strongyloides stercoralis. They are thin, elongated, and have a characteristic shape. These larvae are usually found in freshly passed stools, particularly in cases of hookworm infection. The presence of rhabditiform larvae in stools indicates an active infection and can be used for diagnosis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the question as it does not mention a specific stage of a parasite's life cycle.
**Option B:** This option might be a distractor, but it is not a specific enough answer to be correct. It could refer to various stages of different parasites.
**Option C:** This option might be a distractor, but it is not a specific enough answer to be correct. It could refer to various stages of different parasites.
**Clinical Pearl / High-Yield Fact**
It is essential to note that the presence of rhabditiform larvae in stools is a key diagnostic feature of certain parasitic infections, especially hookworm and Strongyloides stercoralis. A thorough examination of stool samples under microscopy is crucial for identifying these larvae.
**Correct Answer:** C. Strongyloides stercoralis.