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Malaria species recognition

From www.haematologyetc.co.uk



Plasmodium falciparum

PFcombi.jpg


Brief Summary

  • Small fine ring forms with certain characteristic forms
  • Rings have relatively uniform appearance
  • Maurer's dots and clefts in late trophozoites
  • Schizonts very rarely seen
  • Characteristic elongated (often curved) gametocytes


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Plasmodium vivax

PV combi.jpg


Brief summary

  • Large robust rings that become amoeboid during later development
  • Red cells become increasingly enlarged and distorted
  • Schüffner's dots present in appropriately stained samples
  • All forms tend to circulate with large schizont and gametocyte forms


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Plasmodium ovale


PO combi.jpg


Brief summary

  • Large robust rings often retained in late trophozoite stage
  • Red cells enlarged with oval shape and characteristic fimbriation
  • Schüffner's dots seen in well stained samples
  • All forms tend to circulate, parasites large but smaller than for P.vivax


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Plasmodium malariae

PMcombi.jpg


Brief summary

  • Small rings (less delicate than P.falciparum); becoming elongated or solid
  • Red cells often small remaining round with no added dots
  • All forms tend to circulate, characteristic "daisy" schizonts and small round gametocytes
  • Parasite number is often low


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Plasmodium knowlesi

PKcombi.jpg


Brief Summary

  • Very limited geographical distribution
  • Small fine ring forms resemble P.falciparum
  • Later rings are more solid or elongated similar to P.malariae
  • Faint dots (Sinton or Mulligan's stippling) appear at later stages
  • Schizonts & gametocytes resemble P.malariae but are less "neat"
  • Characteristically red cell size is unaffected, although distortion may be seen


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