The cycle of malaria parasite is in sequence of:(1) Exoerythrocytic stage(2) Gametocytic stage(3) Erythrocytic stage(4) Sporogony
## Core Concept
The life cycle of the malaria parasite involves several stages, including the exoerythrocytic stage, erythrocytic stage, gametocytic stage, and sporogony. Understanding the sequence of these stages is crucial for managing and treating malaria.
## Why the Correct Answer is Right
The correct sequence of the malaria parasite's life cycle is:
- **Sporogony** (in the mosquito vector): This stage involves the sexual reproduction of the parasite.
- **Exoerythrocytic stage** (in the human liver): After the sporozoites infect humans, they undergo a stage in the liver.
- **Erythrocytic stage** (in human red blood cells): The parasites then infect red blood cells, leading to their rupture and clinical symptoms.
- **Gametocytic stage** (in human red blood cells): Finally, the parasites develop into gametocytes, which are infectious to mosquitoes.
## Why Each Wrong Option is Incorrect
- **Option A:** This sequence is incorrect because sporogony occurs in the mosquito, not as the first step in the human host, and the stages are not in the correct order.
- **Option B:** This option incorrectly places the gametocytic stage before the erythrocytic stage.
- **Option D:** This sequence incorrectly starts with the erythrocytic stage and omits the correct initial stages.
## Clinical Pearl / High-Yield Fact
A key point to remember is that **Plasmodium vivax and P. ovale** have a dormant liver stage (hypnozoites) during the exoerythrocytic stage, which can reactivate months or years later, leading to relapse. This is crucial for managing malaria and understanding its potential for recurrence.
## Correct Answer: C. 1, 3, 2, 4