On peripheral blood smear examination, which parasite is identified by the presence of a Schüffner's stippling pattern within infected red blood cells?

Explanation

## Schüffner's Stippling in Malaria **Key Point:** Schüffner's stippling refers to fine dots or granules visible within RBCs infected with certain Plasmodium species when stained with Romanowsky stains. These represent cytoplasmic alterations induced by the parasite. ### Plasmodium vivax and Schüffner's Stippling Plasmodium vivax characteristically displays: - Fine, delicate stippling throughout the cytoplasm of infected RBCs - Stippling becomes prominent as the parasite matures - RBCs are enlarged (1.5–2× normal size) - Fimbriae (irregular projections) may appear on the RBC membrane - Schüffner's stippling is **most prominent and consistent** in P. vivax **High-Yield:** P. vivax is the classic example of Schüffner's stippling on NEET PG exams. This is one of the most frequently tested morphological features of malaria parasites. ### Comparison of Stippling Patterns Across Plasmodium Species | Species | Stippling Pattern | RBC Size | Other Features | |---------|-------------------|----------|----------------| | P. vivax | Schüffner's (fine, prominent) | Enlarged (1.5–2×) | Fimbriae, pale cytoplasm | | P. malariae | Maurer's clefts (coarse) | Normal or slightly enlarged | Rare, less prominent | | P. falciparum | Maurer's clefts (coarse) | Normal | Banana-shaped gametocytes | | P. knowlesi | Stippling (fine, less prominent) | Normal | Rapid multiplication | **Clinical Pearl:** The presence of Schüffner's stippling on blood smear is a diagnostic clue to P. vivax infection and helps differentiate it from P. falciparum (which shows Maurer's clefts instead) and P. malariae (which shows stippling only in mature forms). **Mnemonic:** **VIVAX = SCHÜFFNER** — P. vivax is the parasite most characteristically associated with Schüffner's stippling, making it easy to recall.