Enumerate the malarial parasites prevalent in India. Of them, which species is notoriously associated with life-threatening complications? What are the different characteristic peripheral blood smear findings in different species of parasites that cause malaria?
Malarial Parasites Prevalent in India:
The common malarial parasites include Plasmodium vivax, Plasmodium falciparum, Plasmodium malariae, and Plasmodium ovale (rare, sporadic cases). Malaria is transmitted by the bite of female Anopheles mosquitoes, with P. vivax and P. falciparum being the most prevalent and clinically significant.
Species Associated with Life-Threatening Complications:
Plasmodium falciparum causes severe complications such as cerebral malaria, severe anemia, acute renal failure, acute respiratory distress syndrome (ARDS), and multi-organ failure, leading to high mortality if untreated.
Characteristic Peripheral Blood Smear Findings:
P. vivax: Amoeboid trophozoites, schizonts with 12–24 merozoites, large gametocytes; RBCs enlarged, pale, with Schüffner’s dots.
P. falciparum: Small ring forms, multiple per RBC, crescent-shaped gametocytes; schizonts sequestered; RBCs show Maurer’s clefts.
P. malariae: Band-form trophozoites, schizonts with 6–12 merozoites in rosette; RBCs normal.
P. ovale: Compact trophozoites, schizonts with 6–12 merozoites; RBCs enlarged, oval, fimbriated with Schüffner’s dots; gametocytes round/oval.
These features assist in diagnosis, species identification, and management of malaria in endemic regions.
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