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Plasmodium vivax: Morphology: Difference between revisions

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{| class="wikitable" style="border-left:solid 4px navy;border-right:solid 4px navy;border-top:solid 4px navy;border-bottom:solid 4px navy; font-size:90%; color:navy; align:center"
| colspan="1"''|[[P.falciparum late trophozoites gallery|Click for ''P.falciparum'' late trophozoite gallery]]''
| colspan="1"''|[[P.vivax late trophozoites gallery|Click for ''P.vivax'' late trophozoite gallery]]''
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| colspan="1"''|[[P.falciparum schizont gallery|Click for ''P.falciparum'' schizont gallery]]''
| colspan="1"''|[[P.vivx schizont gallery|Click for ''P.vivax'' schizont gallery]]''
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File:PFGc.jpg|link={{filepath:PFGc.jpg}}
File:PVGc.jpg|link={{filepath:PVGc.jpg}}
File:PFG-main image.jpg|link={{filepath:PFG-main_image.jpg}}
File:PVG-main image.jpg|link={{filepath:PVG-main_image.jpg}}
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The sexual replication form (very distinctive).
The sexual replication form (very distinctive).


*Gametocytes are elongated but are restricted into typical shape by the red cell membrane 
*very large with ovoid or distorted forms
*They parasites are rod shaped but the membrane may cause them to curve into a “[[Banana gametocyte|"banana" form]]”
*macrogametocytes female may entirely fill the erythrocyte
*The residual membrane (empty of haemoglobin) is often seen as a "blister" to the side of the parasite
*microgametocytes male may have a thin cytoplasmic rim with visible schu8c3bcffneru8e28099s dots
*The single chromatin area is in the centre of the parasite, often has [[Malaria pigment|pigment]] overlying it
*pigment is clumped over the surface of the gametocyte
*Gametocytes may not be be seen, or may be the only form present (particularly after treatment)




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{| class="wikitable" style="border-left:solid 4px navy;border-right:solid 4px navy;border-top:solid 4px navy;border-bottom:solid 4px navy; font-size:90%; color:navy; align:center"
{| class="wikitable" style="border-left:solid 4px navy;border-right:solid 4px navy;border-top:solid 4px navy;border-bottom:solid 4px navy; font-size:90%; color:navy; align:center"
| colspan="1"''|[[P.falciparum gametocyte gallery|Click for ''P.falciparum'' gametocyte gallery]]''
| colspan="1"''|[[P.vivax gametocyte gallery|Click for ''P.vivax'' gametocyte gallery]]''
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the gametocyte  file pvg.jpg leftt 200px link filepath pvg.jpg *very large with ovoid or distorted forms *macrogametocytes female may entirely fill the erythrocyte *microgametocytes male may have a thin cytoplasmic rim with visible schu8c3bcffneru8e28099s dots *pigment is clumped over the surface of the gametocyte

Revision as of 23:46, 3 April 2024

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The early trophozoite


  • PVETc.jpg
  • PVET main.jpg


The earliest ring forms may be indistinguishable from other species, but during this stage the parasite tends to aquire a more irregular forms and to show signs of modification of the erythrocyte (added dots, and altered size and shape).

  • erythrocytes begin to show increased size and altered shape
  • parasites retain a ring form but may aquire a more irregular form
  • parasites are generally large - occupying up to half of the erythrocyte
  • cytoplasmic Schüffner's dots may appear at this stage, although pigment is less uncommon




The late trophozoite


  • PVLTc.jpg
  • PFVT-main image.jpg



The later growth stage during which parasites grow considerably and lose their ring appearance, this process is accompanied by substantial modification of the red cell and metabolism of it's haemoglobin to form malaria pigment.

  • infected erythrocytes become significantly enlarged and irregular in shape
  • parasites lose their ring appearnace becoming irregular and "amoeboid" in form
  • numerous red/purple Schuffners dots are predent in the cytoplasm of red cells
  • malaria pigment is often present and has an irregular distribution



The schizont


  • PVSc.jpg
  • PVS-main image 2.jpg


The asexual form:

  • a range of maturing schizonts will generally be present within enlarged red cells
  • mature schizonts generally contain 16-24 separate merozoites
  • schu8c3bcffneru8e28099s dots can be detected in any residual cytoplasm of the erythrocyte
  • pigment is visible in irregularly distributed clumps over the schizont surface



The gametocyte

The gametocyte


  • PVGc.jpg
  • PVG-main image.jpg



The sexual replication form (very distinctive).

  • very large with ovoid or distorted forms
  • macrogametocytes female may entirely fill the erythrocyte
  • microgametocytes male may have a thin cytoplasmic rim with visible schu8c3bcffneru8e28099s dots
  • pigment is clumped over the surface of the gametocyte



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