Gallery of early trophozoites: Difference between revisions
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<span style="font-size:90%">''' ''P.falciparum'' '''</span></br> | <span style="font-size:90%">''' ''P.falciparum'' '''</span></br> | ||
<span style="font-size:90%">Small delicate rings, | <span style="font-size:90%">Small delicate rings, and these '''may be the only forms seen in some patients at diagnosis'''. Infected red cells have normal (or slightly crenated) appearance.</br> | ||
<gallery heights=200px widths=200px> | <gallery heights=200px widths=200px> | ||
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<span style="font-size:95%">''' ''P.vivax'' '''</span></br> | <span style="font-size:95%">''' ''P.vivax'' '''</span></br> | ||
<span style="font-size:90%">Rings begin as small forms, but become larger | <span style="font-size:90%">Rings begin as small forms, but become larger asociated with enlarged distorted red cells as they develop. Schüffner's dots will become present | ||
<gallery heights=200px widths=200px> | <gallery heights=200px widths=200px> | ||
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File:PVET2g.jpg|<span style="font-size:80%">Early ring form with faint dots</span>|link={{filepath:PVET2g.jpg}} | File:PVET2g.jpg|<span style="font-size:80%">Early ring form with faint dots</span>|link={{filepath:PVET2g.jpg}} | ||
File:PVET3g.jpg|<span style="font-size:80%">Llarge thickened ring trophozoite</span>|link={{filepath:PVET3g.jpg}} | File:PVET3g.jpg|<span style="font-size:80%">Llarge thickened ring trophozoite</span>|link={{filepath:PVET3g.jpg}} | ||
File:PVET4g.jpg|<span style="font-size:80%">Distorted ting trophozoite and red cell, marked | File:PVET4g.jpg|<span style="font-size:80%">Distorted ting trophozoite and red cell, marked Schüffner's dots</span>|link={{filepath:PVET4g.jpg}} | ||
</gallery>" | </gallery>" | ||
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<span style="font-size:90%">''' ''P.ovale'' '''</span></br> | <span style="font-size:90%">''' ''P.ovale'' '''</span></br> | ||
<span style="font-size:90%">Ring form is retained but enlarges, red cells may develop fimbriation and enlarged ovoid form with James dots. | <span style="font-size:90%">Ring form is retained but enlarges, red cells may develop fimbriation and enlarged ovoid form with visible James' dots. | ||
<gallery mode="traditional" widths=200px heights=200px> | <gallery mode="traditional" widths=200px heights=200px> | ||
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<span style="font-size:95%">''' ''P.malariae'' '''</span></br> | <span style="font-size:95%">''' ''P.malariae'' '''</span></br> | ||
<span style="font-size:95%"> | <span style="font-size:95%">Infected red cells are generally infrequent. Early trophozoites are small in normal or small erythrocytes, and may have central chromatin dot, elongation or angular forms. | ||
<gallery mode="traditional" widths=200px heights=200px> | <gallery mode="traditional" widths=200px heights=200px> | ||
Revision as of 13:26, 27 November 2024
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General Comments: At the very earliest point all trophozoites appear as ring forms and species differences are very difficult to distinguish - some "species specific" features may appear as parasites mature toward late trophozoite stages.
P.falciparum
Small delicate rings, and these may be the only forms seen in some patients at diagnosis. Infected red cells have normal (or slightly crenated) appearance.
Fine ring form
Double dot form and normal ring
Accolé and double dot forms
Multiple parasite form
"
P.vivax
Rings begin as small forms, but become larger asociated with enlarged distorted red cells as they develop. Schüffner's dots will become present
Early ring form
Early ring form with faint dots
Llarge thickened ring trophozoite
Distorted ting trophozoite and red cell, marked Schüffner's dots
"
P.ovale
Ring form is retained but enlarges, red cells may develop fimbriation and enlarged ovoid form with visible James' dots.
Early ring form
Ring with dots/fimbriation
faint Ziemann's dots
Ring early ovoid change
"
P.malariae
Infected red cells are generally infrequent. Early trophozoites are small in normal or small erythrocytes, and may have central chromatin dot, elongation or angular forms.
Ring form in small red cell
The central chromatin dot
Early elongation, Stinton's dots
Early angularity of form
"
P.knowlesi
At the early trophozoite stage an infection by P.knowlesi resembles that of P.falciparum and the number of infected cells amy be high. Forms found may also resemble P.falciparum with parasites that have double chromatin dots, multiply infected red cells, or accolé forms. This may create diagnostic difficulty in cases where only early trophozoites are present. Later forms however begin to resemble parasites of P.malariae and these should be specifically sought where infections arise in geographical areas associated with this parasite.
Fine early rings
Double dot (right)
Accolé form
Multiple infection
