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Chapter 21 : Intestinal Protozoa: Amebae

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Abstract:

    • spp.

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.1
Figure 21.1

Life cycle of . doi:10.1128/9781555819002.ch21.f1

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.2
Figure 21.2

( ) Trophozoite of ; ( ) trophozoite of /. ; (3 and 4) early cysts of /. ; (5 to 7) cysts of /. ; (8 and 9) trophozoites of ; (10 and 11) early cysts of ; (12 to 14) cysts of ; (15 and 16) trophozoites of ; (17 and 18) cysts of . doi:10.1128/9781555819002.ch21.f2

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.3
Figure 21.3

(a) Trophozoite of . (b) Trophozoite of . . . (c and d) Cysts of . . / (d is a precyst with a single nucleus). (e and f) Trophozoites of . (g to i) Cysts of (g is a precyst with two nuclei). Note the chromatoidal bars in panel h and the shrunken cyst (which is often seen in permanent stained smears) in panel i. Panel j represents an artifact that mimics an cyst (permanent stain). (Panel g is courtesy of the CDC Public Health Image Library.) doi:10.1128/9781555819002.ch21.f3

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.4
Figure 21.4

Amebic intestinal abscess. Note the “flask” shape (small opening on the mucosal surface and a larger area of destruction below the surface). (Courtesy of the CDC Public Health Image Library; Mae Melvin.) doi:10.1128/9781555819002.ch21.f4

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.5
Figure 21.5

Liver containing multiple amebic abscesses. The necrotic tissue has been removed from one portion, leaving a cavity. Magnification, ×0.4. (Armed Forces Institute of Pathology photograph.) doi:10.1128/9781555819002.ch21.f5

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.6
Figure 21.6

Amebic liver abscess. (Both images courtesy of the CDC Public Health Image Library.) doi:10.1128/9781555819002.ch21.f6

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Algorithm 21.1
Algorithm 21.1

Intestinal amebiasis. Fecal immunoassay kits can be used on human stool specimens to identify organisms in the group / or to differentiate from . Currently available reagents require fresh or frozen specimens only. *, trophozoites containing RBCs confirmatory for ; trophozoites with no ingested RBCs and/or cysts confirm only the / group. doi:10.1128/9781555819002.ch21.Alg21.1

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Algorithm 21.2
Algorithm 21.2

Amebic liver abscess. *, trophozoites containing RBCs confirmatory for ; trophozoites with no ingested RBCs and/or cysts confirm only the / group. doi:10.1128/9781555819002.ch21.Alg21.2

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.7
Figure 21.7

Life cycle of , the same as and . doi:10.1128/9781555819002.ch21.f7

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.8
Figure 21.8

Life cycle of , , , , and . doi:10.1128/9781555819002.ch21.f8

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.9
Figure 21.9

(Upper) Trophozoites of ; (lower) cysts of . (Note that cysts often contain only two nuclei, instead of the mature four nuclei.) doi:10.1128/9781555819002.ch21.f9

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.10
Figure 21.10

(Upper, left) Cyst of (illustration) (note the large inclusion in the cytoplasm as seen in the drawing); (right) cyst of (direct wet mount with iodine; large vacuole is more difficult to see; however, chromatoidal bars are present). (Lower, left and right) cyst forms (the large inclusion is visible in both organisms). doi:10.1128/9781555819002.ch21.f10

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.11
Figure 21.11

(Upper) Trophozoite of (illustration by Sharon Belkin). (Lower, left and right) Trophozoites of (note the ingested polymorphonuclear leukocytes—arrows). Both stained with iron-hematoxylin. doi:10.1128/9781555819002.ch21.f11

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.12
Figure 21.12

(1 to 5) Trophozoites of ; (6 to 10) cysts of ; (11 to 13) trophozoites of ; (14 to 16) cysts of . . doi:10.1128/9781555819002.ch21.f12

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.13
Figure 21.13

(Upper, left and right) Trophozoites of (note the nuclear variation in both organisms). (Lower) Cysts of , containing four karyosomes with no peripheral chromatin; (left) note the vacuole. This can be confused with an . cyst; however, an cyst contains four nuclei, not just one. doi:10.1128/9781555819002.ch21.f13

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.14
Figure 21.14

(Upper, left and right) Trophozoites of (note the very large karyosome within the nucleus). (Lower, left) Cyst of . wet mount stained with iodine (note the large glycogen vacuole—stains brownish with iodine); (right) . cyst on trichrome-stained permanent stain (also note the large vacuole—appears clear on permanent stain). doi:10.1128/9781555819002.ch21.f14

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.15
Figure 21.15

Life cycle of spp. (A) Cyst forms are excreted in the feces of infected hosts. (B) Humans acquire infection by consumption of food or water contaminated with feces containing cysts. (C) Excystation occurs in the large intestine to release the vacuolar form. The vacuolar form (C1) can transform into the granular form (C2) or the ameboid form (C3) and vice versa. The vacuolar form multiplies by binary fission (C4) (other modes of reproduction such as plasmotomy and budding can also occur). The vacuolar form undergoes encystation in the lumen of the large intestine to produce the cyst form, which is shed in the feces. (Adapted with permission from and .) doi:10.1128/9781555819002.ch21.f15

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.16
Figure 21.16

Various forms of . (a) Vacuolar forms of having a large centrally placed vacuole showing extensive variation in size (arrows). (b) Granular forms with distinct granules filling the central body. (c) Ameboid form with characteristic pseudopodia. (d) Cyst forms. Note the smaller size and the characteristic refractile cyst wall surrounded by loose irregular outer coat. Bar, 10 μm. (Reproduced from .) doi:10.1128/9781555819002.ch21.f16

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Image of Figure 21.17
Figure 21.17

(Top, middle) Stained central-body forms of spp.; note the multiple nuclei around the edges, outside the central-body area. (Bottom) central-body forms in iodine wet mounts; note dividing form in right image (binary fission) and the large central “vacuole.” doi:10.1128/9781555819002.ch21.f17

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
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Tables

Generic image for table
TABLE 21.1

Intestinal protozoa: trophozoites of common amebae

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
Generic image for table
TABLE 21.2

Intestinal protozoa: cysts of common amebae

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
Generic image for table
TABLE 21.3

Intestinal amebae: recommended diagnostic procedures

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
Generic image for table
TABLE 21.4

Commercial assays (antigen, antibody, molecular):

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
Generic image for table
TABLE 21.5

Intestinal protozoa: trophozoites of less common amebae

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
Generic image for table
TABLE 21.6

Intestinal protozoa: cysts of less common amebae

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
Generic image for table
TABLE 21.7

Key features of

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21
Generic image for table
TABLE 21.8

Measures for the prevention of infection with intestinal protozoa

Citation: Garcia L. 2016. Intestinal Protozoa: Amebae, p 552-583. In Diagnostic Medical Parasitology, Sixth Edition. ASM Press, Washington, DC. doi: 10.1128/9781555819002.ch21

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