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Gallery of gametocytes: Difference between revisions

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(Created page with "{{DISPLAYTITLE:<span style="position: absolute; clip: rect(1px 1px 1px 1px); clip: rect(1px, 1px, 1px, 1px);">{{FULLPAGENAME}}</span>}} ---- '''Navigation'''</br> <span style="font-size:90%">>Main Malaria Index''</span></br> <span style="font-size:90%">>>Galleries Index Page''</span></br> <span style="font-size:90%">>>>Current page: '''Gallery of gametocytes'''</span> ---- <span style="font-size:140%; color:navy">'''Gallery of Gametocy...")
 
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<span style="font-size:140%; color:navy">'''Gallery of Gametocytes'''</br></span>
<span style="font-size:140%; color:navy">'''Gallery of Gametocytes'''</br></span>
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<span style="font-size:90%">Schizont morphology is variable as they progress from late trophoxoites, dividing their chromatin into seprate distict masses (usually a schizont is defined by have more than two masses to distinguish them from rings with double dots). The morphological variability then continues as the merozoites separate before release. However, despite this, some features such as erythocyte size and shape, added dots, pigment distribution and the number of merozoites present can still be useful (as can the fact that they are rarely seen in ''P.falciparum''.</br></br>
<span style="font-size:90%">Gametocytes essentially have "microgametocyte" (male) or "macrogametocyte" (female) appearance. For most species the gametocyte is round or slightly angular with species differences mainly reflected in the size of the red cell or parasite, although red cell dots may be seen in ''P.vivax'' or ''P.ovale''. The exception is the ''P.falciparum'' parasite that has an elongated rod form that may become curved by the residual erythroid membrane - sometime called the "banana" form..</br></br>
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<span style="font-size:90%">''' ''P.falciparum'' '''</span></br>
<span style="font-size:90%">''' ''P.falciparum'' '''</span></br>

Revision as of 18:53, 30 November 2024

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 >>Galleries Index Page
 >>>Current page: Gallery of gametocytes

Gallery of Gametocytes
Gametocytes essentially have "microgametocyte" (male) or "macrogametocyte" (female) appearance. For most species the gametocyte is round or slightly angular with species differences mainly reflected in the size of the red cell or parasite, although red cell dots may be seen in P.vivax or P.ovale. The exception is the P.falciparum parasite that has an elongated rod form that may become curved by the residual erythroid membrane - sometime called the "banana" form..

P.falciparum
Loose and often "tatty" appearances with 8-16 merozoites and clumped pigment when mature. Rare in blood as they sequesterin tissues and circulating form may appear degenerate. Images show mature forms.

  • Variable merozoite number, clumped pigment

    Variable merozoite number, clumped pigment

  • Degenerate small merozoite

    Degenerate small merozoite

  • Large merozoites

    Large merozoites

  • Large merozoites

    Large merozoites

"

P.vivax
Charactertically large and Schüffner's dots may be seen. The merozoites tend to pack the red cell with numbers up to 16-32 in mature merozoites. Pigment has diffuse distribution. Images show a maturing sequence.

  • Early form with separate chromatin but no individual merozoites

    Early form with separate chromatin but no individual merozoites

  • Similar to previous, note Schüffner's dots

    Similar to previous, note Schüffner's dots

  • Maturing form with separate merozoites

    Maturing form with separate merozoites

  • Large mature form, note patchy pigment

    Large mature form, note patchy pigment

"

P.ovale
Share many features with P.vivax and may not be easy to distinguish, tend not to be as large with fewer merozoites (up to 16). Ovoid shape and fimbriation of red cells may be present together with James' dots. Pigment has a patchy distribution.

  • Early small form note James' dots

    Early small form note James' dots

  • Early form, merozoites still form a single mass

    Early form, merozoites still form a single mass

  • Small mature form with separated merozoites

    Small mature form with separated merozoites

  • Mature larger form, note ovoid shape

    Mature larger form, note ovoid shape

"

P.malariae
Small and often neat parasites with few merozoites when mature (generally around 8). Often there is a central clump of pigment with merozoites arranged around this (daisy head appearance).

  • Early schizont with multiple chromatin dots

    Early schizont with multiple chromatin dots

  • A daisy with merozoites around central pigment

    A daisy with merozoites around central pigment

  • A less well formed daisy, note small size

    A less well formed daisy, note small size

  • Late form prior to merozoite release

    Late form prior to merozoite release

"

P.knowlesi
Similar in appearance to P.malariae. The forms tend to be small with relatively few merozoites present. Pigment tend to form a clump.

  • Early form with few chromatin masses

    Early form with few chromatin masses

  • Almost a daisy with central clumped pigment

    Almost a daisy with central clumped pigment

  • Prior to release of merozoites

    Prior to release of merozoites

  • Immediately before merozoite release

    Immediately before merozoite release

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