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PRACTICAL
ON BLOOD
PARASITES
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The two methods common in use :
1: Light microscopy
2: Rapid diagnostic tests (RDTs).
Common methods for parasitological diagnosis of
malaria
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aboratory diagnosis of malaria
Rapid diagnostic tests detect
malaria antigens
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Rapid diagnostic tests detect malaria antigens
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Laboratory diagnosis of malaria
Light microscopy:1: Preparing blood film
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Light microscopy:1: Preparing blood film
Laboratory diagnosis of malaria
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Laboratory diagnosis of malaria
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Light microscopy:1: Preparing blood filmLaboratory diagnosis of malaria
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Light microscopy:1: Preparing blood filmLaboratory diagnosis of malaria
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Light microscopy:1: Preparing blood filmLaboratory diagnosis of malaria
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Light microscopy: Thick and thin films
Laboratory diagnosis of malaria
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Plasmodium falciparum (trophozoitestage in thick smear)
CCMOVBD
Plasmodium falciparum (trophozoitestage in thin smear)
Laboratory diagnosis of malaria
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13 Morphology of Malaria
3. Gametocyte
The Malaria Parasite
Three developmental
stages seen in blood
films:
1. Trophozoite
2. Schizont
CCMOVBD CCMOVBD
Trophozoites
CCMOVBD
GametocyteSchizont
CCMOVBD
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14 Morphology of Malaria
Features of Plasmodium
CCMOVBD
Nucleus/chromatin dot
Cytoplasm
Stippling
Vacuole
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15 Morphology of Malaria
Species of malaria is identified by itsmicroscopic appearance:
CCMOVBDPlasmodium falciparum
CCMOVBDPlasmodium vivax
CCMOVBDPlasmodium malariae
Malaria Tutorials, Wellcome Trust Plasmodium ovale
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16 Morphology of Malaria
PLASMODIUM FALCIPARUM (TROPHOZOITE STAGE)
Diagnostic Points:Small, regular, fine to
fleshy cytoplasm
Infected RBCs not
enlargedNumerous, multiple
infection is common
Ring, comma, marginal or
accole forms are seen;often have double
chromatin dots
Maurers dots not clearly
visible
CCMOVBD
Multiple infection
Double chromatin
Marginal form
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17 Morphology of Malaria
Plasmodium falciparum(trophozoite stage in thin smear)
CCMOVBD
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18 Morphology of Malaria
CCMOVBD
Plasmodium falciparum(trophozoite stage in thick smear)
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19 Morphology of Malaria
Diagnostic Points:
Small, rarely fill the RBC
Rare in peripheral blood
16-32 or more merozoites
in compact cluster
Single dark pigment
Usually associated with
many young ring forms
CCMOVBD
CCMOVBD
Plasmodium falciparum (schizont stage)
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20 Morphology of Malaria
Plasmodium falciparum(trophozoite and schizont stages in thin smear)
CCMOVBD
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21 Morphology of Malaria
Diagnostic Points:
Banana-shaped or rounded
Macrogametocyte
small, compact, central
chromatin dot
pigments closely adhereto the chromatin
Microgametocyte
broader, shorter and more
sausage-shaped loosely scattered chromatin
golden brown pigmentsscattered at the central half
CCMOVBD
CCMOVBD
Plasmodium falciparum (gametocyte stage)
22 M h l f M l i
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22 Morphology of Malaria
Plasmodium falciparum(gametocyte stage in thin smear)
CCMOVBD
23 M h l f M l i
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23 Morphology of Malaria
Diagnostic Points:
Infected red cells usually
enlarged
Irregular or fragmentedcytoplasm (amoeboid)
Mature ring forms tend to
be large and coarse
Schuffners dots (stippling)
are frequently visible
CCMOVBD
CCMOVBD
Plasmodium vivax (trophozoite stage)
24 M h l f M l i
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24 Morphology of Malaria
Plasmodium vivax(trophozoite stages in thin smear)
CCMOVBD
Ring form
CCMOVBD
Developing trophozoite
CCMOVBD
Mature Trophozoite
25 Morphology of Malaria
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25 Morphology of Malaria
Diagnostic Points:
Large, covering almost
or the entire enlarged RBC
Few to moderate1224 merozoites in
irregular cluster
Yellowish-brown loose
pigmentsCCMOVBD
Plasmodium vivax (schizont stage)
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Platelet
This RBC
has two
rings.
Schffners
dots are
present in
this cell.
This RBC is not as
enlarged as the
others. Schffners
dots are not visible.
In this malarial infection RBC is enlarged and oval, schuffner's
dot is present. Trophozoite ring is 1/3 diameter of cell with
heavy chromatin dot
27 Morphology of Malaria
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27 Morphology of Malaria
Diagnostic Points:
Round; large
Usually compact nucleus
the periphery
Chromatin is deep red
or magenta
CCMOVBD
CCMOVBDCCMOVBD
Plasmodium vivax (gametocyte stage)
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29 Morphology of Malaria
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29 Morphology of Malaria
Diagnostic Points:
Small, few
Ring to rounded, compact,
vacuolated or non-
vacuolated,Band forms seen
Dark, scattered pigments
Ziemmans stipplings not
clearly visible
Infected red cell not
enlarged
CCMOVBD
CCMOVBD
Plasmodium malariae (trophozoite stage)
30 Morphology of Malaria
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30 Morphology of Malaria
Diagnostic Points:
Small, compact, dark
Usually few
6-12 merozoites in
rosette formation, but
more often in irregular
cluster
Concentrated pigments
CCMOVBD
CCMOVBD
Plasmodium malariae (schizont stage)
31 Morphology of Malaria
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31 Morphology of Malaria
Diagnostic Points:Smaller than P. vivax
Few
Ring to rounded, compactSingle, prominent chromatin
Schizonts with 4-12
merozoites
Reported in the PhilippinesMalaria Tutorials, Wellcome Trust
Plasmodium ovale
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Infection of an individual by
more than one species of
Plasmodium
Common in endemic areas
in the Philippines
P. falciparumand P. vivax
Can easily be overlooked
(blood films must be
studied carefully to rule outmixed infections)
CCMOVBD
Mixed infections
33 Morphology of Malaria
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33 Morphology of Malaria
P. vivax trophozoite andP. falciparumgametocyte(Mixed infection, thin smear)
CCMOVBD
34 Morphology of Malaria
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34 Morphology of Malaria
Plasmodium falciparum
CCMOVBD
35 Morphology of Malaria
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p gy
CCMOVBD
Plasmodium malariae
36 Morphology of Malaria
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p gy
Plasmodium vivax
37 Morphology of Malaria
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p gy
Plasmodium falciparum
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A 25 year-old male from India, who came 3 months ago was admitted in
KKUH with a history of severe anaemia and intermittent high grade fever
for the last two months not responding to antibiotics.
WHAT IS THE DIAGNOSIS?
Diagnosis: Plasmodium vivax
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A businessman who makes frequent trips to Thailand , presents with
intermittent fever .
WHAT IS THE DIAGNOSIS?
Diagnosis: Plasmodium vivax
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A student in KSU who returned three weeks from vacation in Africa , he
developed intermittent fever last week and lost consciousness a short
time ago.
WHAT IS THE DIAGNOSIS?
Diagnosis: Plasmodium falciparum
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A 7 year old child presented with anemia , hepatospenomegaly and
fever .Not responding to antimalarials and antibiotics . Bone marrow
smear is shown
ARE THERE ANY PARASITES? WHAT STAGE ?
Leishmania , amastigote stage