Which of the following parasite can enters through intact skin?
**Core Concept**
The question is testing the ability to identify a parasite that can penetrate intact skin, which is a characteristic feature of certain pathogens. This concept is relevant to the field of parasitology, specifically the study of skin-penetrating parasites.
**Why the Correct Answer is Right**
The parasite **Leishmania** can enter the human body through intact skin, typically through the bite of an infected sandfly. This occurs when the sandfly injects promastigotes, the flagellated form of the parasite, into the skin during feeding. The promastigotes then transform into amastigotes, which multiply within macrophages and cause the disease. This process is facilitated by the parasite's ability to penetrate the skin and evade the host's immune response.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is intentionally left blank, as the question does not provide a distractor for this choice.
**Option B:** This option is incorrect because **Toxoplasma gondii** typically enters the body through the ingestion of contaminated food or water, not through intact skin.
**Option C:** This option is incorrect because **Plasmodium** species, which cause malaria, are transmitted through the bite of an infected mosquito and enter the body through the bloodstream, not through intact skin.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that **Leishmania** can cause a range of diseases, from cutaneous leishmaniasis to visceral leishmaniasis, depending on the species and the location of the infection. This knowledge is crucial for diagnosing and treating patients with skin lesions or other symptoms suggestive of a parasitic infection.
**Correct Answer:** C. Leishmania.