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Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infectious disease?

1. Leukemia
2. Thalassemia
3. Sickle cell anaemia
4. Pernicious anaemia

Correct answer: Sickle cell anaemia

Solution

Sickle cell anaemia is harmful because it causes abnormal, fragile red blood cells and anemia. However, the sickle-cell trait/condition gives partial protection against malaria, a mosquito-borne disease, because the parasite does not thrive as well in sickled cells.

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