Page 447 - Review of Medical Microbiology and Immunology ( PDFDrive )

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PART VI Parasitology
436

E
B

C F
A
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H
G
FIGURE 52–2
A: Plasmodium vivax signet-ring trophozoite within a red blood cell. B: Plasmodium vivax ameboid trophozoite
within a red blood cell, showing Schüffner’s dots. C: Plasmodium vivax mature schizont with merozoites inside. D: Plasmodium vivax
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microgametocyte. E: Plasmodium vivax macrogametocyte. F: Plasmodium falciparum “banana-shaped” gametocyte with attached red
cell ghost. G: Toxoplasma gondii trophozoites within macrophage. H: Pneumocystis jiroveci cysts. (A–G, 1200×; H, 800×.)
More than 200 million people worldwide have malaria,
infection without adequate chemoprophylaxis and in
and more than 1 million die of it each year, making it the
immigrants from areas of endemic infection. It is not
most common lethal infectious disease. It occurs primarily
endemic in the United States. Certain regions in Southeast
in tropical and subtropical areas, especially in Asia, Africa,
and Central and South America. Malaria in the United
Asia, South America, and east Africa are particularly
affected by chloroquine-resistant strains of P. falciparum.
People who have lived or traveled in areas where malaria
occurs should seek medical attention for febrile illnesses up
to 3 years after leaving the malarious area.
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FIGURE 52–3
Plasmodium falciparum—ring-shaped trophozo-
mebooksfree.com mebooksfree.com mebooksfree.com FIGURE 52–4 Plasmodium falciparum—gametocyte. Arrow mebooksfree.com
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ite. Long arrow points to a red blood cell containing a ring-shaped
trophozoite. Arrowhead points to a red blood cell containing four
ring-shaped trophozoites. Note the very high percentage of red cells
containing ring forms. This high-level parasitemia is more often seen
in Plasmodium falciparum infection than in infection by the other
points to a “banana-shaped” gametocyte of Plasmodium falciparum.
(Source: Dr. S. Glenn, Public Health Image Library, Centers for Disease Control and
plasmodia. (Source: Dr. S. Glenn, Public Health Image Library, Centers for Disease
Control and Prevention.)
Prevention.)

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