Which of the following parasites causes malaria?

MP NHM CHO-2024 (Shift-2)

Applied Microbiology & Infection control

Easy

Appeared in: MP NHM CHO-2024 (Shift-2)

Explanation

Malaria is a life-threatening disease caused by a protozoan parasite belonging to the genus Plasmodium.
The parasite is transmitted to humans through the bites of infected female Anopheles mosquitoes.
Five species are known to cause disease in humans: P. falciparum, P. vivax, P. ovale, P. malariae, and P. knowlesi.
The parasite's life cycle involves two hosts: humans and mosquitoes. In humans, it first infects liver cells and then red blood cells.

Option A: Nematodes are multicellular parasitic roundworms (helminths), not unicellular protozoa. They cause different types of infections, such as intestinal worm infestations.
Option B: Acanthamoeba is a free-living amoeba, a different type of protozoan. It is known to cause rare but severe infections of the eye (keratitis) and brain (granulomatous amebic encephalitis).
Option D: Flavivirus is a genus of viruses, which are fundamentally different from parasites. Viruses are infectious agents that replicate only inside the living cells of other organisms.

Visual 1: Diagram - The life cycle of the Plasmodium parasite. This visual would help learners understand the two stages of the parasite's life (in the mosquito and in the human), including the liver and blood stages, which explains the disease's progression and symptoms.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Causative agent of Malaria as background academic context rather than a clinical decision trigger.
A nurse's primary role in malaria management includes patient education on preventive measures like using insecticide-treated bed nets, wearing protective clothing, and using insect repellent.
Accurate identification of the causative agent is crucial. For example, P. falciparum can cause severe, life-threatening malaria and requires aggressive treatment, while P. vivax and P. ovale can have dormant liver stages (hypnozoites) requiring specific drugs to prevent relapse.
What if? If a patient with malaria is pregnant, the choice of antimalarial drugs is critical. Some drugs are contraindicated in pregnancy due to potential harm to the fetus. The nurse must ensure the correct, safe medication is administered and monitor both mother and fetus closely.

How to Approach the Question

First, identify the key terms in the question: "parasite" and "malaria". This is a factual recall question asking for the specific pathogen that causes a known disease.
Access your knowledge of microbiology and infectious diseases. Recall or look for the causative agent of malaria.
Evaluate each option to determine its classification. Plasmodium is a protozoan parasite.
Analyze the distractors: Nematodes are worms, Acanthamoeba is an amoeba causing different infections, and Flavivirus is a virus. These are different categories of pathogens.
By correctly identifying Plasmodium as the protozoan parasite responsible for malaria and eliminating the other options based on their different classifications and associated diseases, you can confidently select the correct answer.

Concept Tested & Keywords

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