Question:
Identify the organism related to the blood smear image.
Identify the organism related to the blood smear image.
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Ring forms inside red cells mean the malaria parasite.
Updated On: Jun 24, 2026
- Plasmodium malariae
- S. Typhi
- Treponema pallidum
- Toxoplasma gondii
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The Correct Option is A
Solution and Explanation
Step 1: The blood smear shows intra-erythrocytic ring-form trophozoites, which is the diagnostic appearance of malaria parasites inside red blood cells.
Step 2: Thick smears are used to detect the presence of parasites, while thin smears allow species identification. This thin smear shows multiple early ring-form trophozoites within red cells, consistent with a Plasmodium species (malaria parasite).
Step 3: Salmonella Typhi is diagnosed by blood culture, Treponema pallidum by dark-field or serology, and Toxoplasma typically by serology. The organism on this smear is the malaria parasite, so the answer is Plasmodium.
Step 2: Thick smears are used to detect the presence of parasites, while thin smears allow species identification. This thin smear shows multiple early ring-form trophozoites within red cells, consistent with a Plasmodium species (malaria parasite).
Step 3: Salmonella Typhi is diagnosed by blood culture, Treponema pallidum by dark-field or serology, and Toxoplasma typically by serology. The organism on this smear is the malaria parasite, so the answer is Plasmodium.
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