20 High Yield MCQs on Malaria
Top 20 MCQs on Malaria with Rationale
1. Which of the following is the most common species of Plasmodium that causes severe malaria?
A. Plasmodium vivax
B. Plasmodium ovale
C. Plasmodium malariae
D. Plasmodium falciparum
Rationale: P. falciparum is known for causing the most severe and deadly form of malaria, leading to complications like cerebral malaria.
2. What is the primary vector responsible for transmitting malaria?
A. Aedes mosquito
B. Anopheles mosquito
C. Culex mosquito
D. Tabanos fly
Rationale: The Anopheles mosquito is the primary vector for malaria transmission, specifically female mosquitoes.
3. What is the causative agent of malaria?
A. Bacteria
B. Virus
C. Protozoa
D. Fungi
Rationale: Malaria is caused by protozoan parasites of the genus Plasmodium.
4. Which stage of the Plasmodium life cycle is injected into humans during a mosquito bite?
A. Merozoites
B. Sporozoites
C. Gametocytes
D. Oocytes
Rationale: Sporozoites are injected into the bloodstream when an infected mosquito bites a human.
5. What is the main symptom of malaria?
A. Cough
B. High fever and chills
C. Abdominal pain
D. Skin rash
Rationale: Malaria typically presents with cyclical fever, chills, and sweating due to the synchronous rupture of red blood cells.
6. Which organ in the human body is primarily affected by malaria?
A. Heart
B. Liver
C. Lungs
D. Kidneys
Rationale: The liver is where the Plasmodium parasites undergo their first developmental stage after being injected by mosquitoes.
7. What is the typical treatment for uncomplicated malaria caused by P. falciparum?
A. Chloroquine
B. Quinine
C. Artemisinin-based combination therapy (ACT)
D. Metronidazole
Rationale: ACTs are recommended as first-line treatment for uncomplicated P. falciparum malaria due to their effectiveness.
8. Which of the following populations is at highest risk for severe malaria?
A. Adults over 60 years old
B. Pregnant women and children under five
C. Athletes
D. Office workers
Rationale: These groups are particularly vulnerable due to weaker immune systems and increased susceptibility to infections.
9. What does the presence of Schuffner's dots in red blood cells indicate?
A. Infection with P. falciparum
B. Infection with P. vivax or P. ovale
C. Infection with P. malariae
D. None of the above
Rationale: Schuffner's dots are characteristic features observed in red blood cells infected with P. vivax or P. ovale.
10. Which test is commonly used to diagnose malaria?
A. Blood smear examination
B. Urinalysis
C. CT scan
D. MRI scans
Rationale: A blood smear allows for direct visualization of malarial parasites within red blood cells.
11. What is the role of gametocytes in the life cycle of Plasmodium?
A. They cause symptoms in humans.
B. They are responsible for transmission to mosquitoes.
C. They invade liver cells.
D. They reproduce asexually in red blood cells.
Rationale: Gametocytes are sexual forms of the parasite that develop into sporozoites in mosquitoes, facilitating transmission.
12. Which type of immunity provides some protection against malaria?
A. Innate immunity only
B. Adaptive immunity only
C. Both innate and adaptive immunity
D. No immunity exists
Rationale: Both types of immunity contribute to resistance against malaria; genetic factors can also play a role (e.g., sickle cell trait).
13. What complications can arise from severe malaria infection?
A. Dehydration only
B. Cerebral malaria and anaemia
C. Hypertension only
D. Diabetes mellitus
Rationale: Severe malaria can lead to serious complications like cerebral malaria, which affects neurological function, and anaemia due to hemolysis.
14. Which preventive measure is most effective against malaria?
A. Vaccination only
B. Use of insecticide-treated bed nets (ITNs)
C. Taking antibiotics
D. Drinking herbal teas
Rationale: ITNs significantly reduce mosquito bites during sleep, thereby lowering the risk of malaria transmission.
15. Which group has been shown to have some resistance to malaria due to genetic factors?
A. Individuals with type O blood
B. Individuals with sickle cell trait (HbAS)
C. Individuals over 50 years old
D. Individuals who have traveled extensively
Rationale: Individuals with sickle cell trait have some protection against severe forms of malaria due to altered red blood cell morphology.
16. Which medication is used as prophylaxis against malaria in travellers?
A. Aspirin
B. Chloroquine
C. Ibuprofen
D. Acetaminophen
Rationale: Chloroquine can be used prophylactically in areas where resistance has not developed; other options may include atovaquone-proguanil or doxycycline depending on resistance patterns.
17. What percentage of people infected with P. falciparum develop severe disease if untreated?
A. 10%
B. 25%
C. 50%
D. 100%
Rationale: Approximately half of untreated cases can progress to severe disease or death, highlighting its virulence.
18. What is an important vector control strategy in reducing malaria transmission?
A. Use of chemical fertilizers
B. Indoor residual spraying (IRS)
C. Planting more trees
D. Increasing urbanization
Rationale: IRS involves spraying insecticides inside homes, effectively killing mosquitoes that rest on walls.
19. Which vaccine was recommended by WHO for use in children at risk for malaria as of 2021?
A. RTS, S/AS01 (Mosquirix)
B. MMR vaccine
C. HPV vaccine
D. Influenza vaccine
Rationale: RTS, S/AS01 is designed specifically for young children in areas with moderate to high transmission rates.
20. Which symptom indicates that someone may have progressed to severe malaria?
A. Mild headache
B. Persistent vomiting
C. Rash
D. Fatigue
Rationale: Persistent vomiting can be an indicator of severe disease progression, along with other symptoms like altered consciousness.
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