FACT OR ARTIFACT LEARN THE KEYS TO DIFFERENTIATE PARASITES FROM ARTIFACTS
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1 FACT OR ARTIFACT LEARN THE KEYS TO DIFFERENTIATE PARASITES FROM ARTIFACTS
2 ACMLT CONFERENCE OCTOBER 1, 2005 PRESENTED BY PAULINE TOMLIN Public Health Microbiology 2
3 FACT OR ARTIFACT Many body sites and specimens can be examined for parasites. The most difficult specimen to differentiate parasites from artifacts is fecal material. Feces consists of many components, which include: 3
4 Cont d Undigested food residue Digestive by products Epithelial cells Microorganisms (bacteria & yeasts) Secretions from the digestive tract 4
5 Cont d Due to the ratio between fecal debris and parasites, many artifacts have been incorrectly identified as: Protozoan trophozoites & cysts Helminth eggs & larvae 5
6 Minimizing the Errors Appropriate training (maintenance of competency) Adherence to protocols Use of quality control measures Availability of reference materials Availability of consultants (ProvLab) Involvement in Proficiency program 6
7 Fact or Artifact? 7
8 Fact or Artifact? 8
9 Pencil Sketch 9
10 Close-up View Note the short buccal cavity & the prominent genital primordium that distinguishes it from hookworm. In hookworm the (bc) is long & the (gp) is inconspicuous 10
11 Side by Side Strongyloides larva Plant hair 11
12 Consequences of Error Strongyloidiasis Larvae normally very scant in feces, many infections go undiagnosed Infections are frequently latent Hyperinfection due to autoinfection (could be fatal) Patients from endemic areas selected for immunosuppressive therapy should be screened for this infection. 12
13 Fact or Artifact? 13
14 Fact or Artifact? 14
15 Pathogenic or not? T. hominis flagella T. vaginalis T. hominis is pyriform has both an axostyle & undulating membrane. The membrane extends to the entire length of the body, in contrast to that seen in T. vaginalis. Note the large anterior nucleus and the four anterior flagella of T. vaginalis. 15
16 Compare!! T. hominis Epithelial cell flagella T. vaginalis T. vaginalis 16
17 Consequences of Trichomoniasis Vaginal infections in female Infections of the prostate and the epididymis in males T. vaginalis infection is an important STD disease throughout the world. T. hominis is non-pathogenic 17
18 Fact or Artifact? 18
19 Fact or Artifact? 19
20 Fact or Artifact? 20
21 Fact or Artifact? 21
22 Fact or Artifact? 22
23 E. histolytica/dispar & Artifacts PMN s E.coli PMN s macrophage Pencil Sketches 23
24 Both Stages of E. coli trophozoite cb nucleus Note the large diffuse eccentric karyosome Peripheral chromatin is block-like Cytoplasm is vacuolated Note the cyst with seven of its eight nuclei. A chromatoidal body(cb) is also present 24
25 Phases of E. histolytica/dispar karyosome bar trophozoite Cyst with chromatoid bar Cyst( 2 nuclei) Cyst (bar & 4 nuclei) 25
26 Fact & Artifact!! macrophage WBC E. histolytica/dispar troph E.histo.dispar (cyst) 26
27 Consequences of E.histolytica Amebiasis (amebic dysentery) Ulcers in the lumen of colon and cecum Tissue envasion may involve colon & extraintestinal locations (liver, lung, brain, skin & other tissues). 27
28 Fact or Artifact? 28
29 Fact or Artifact? 29
30 Compare mb n The Giardia troph exhibit the pyriform shape & two anteriorly placed nuclei, located on either side of the axonemes. Giardia lamblia troph Spore The dark stained median bodies are also visible below the nuclei. Because they stain poorly, flagella are rarely seen 30
31 Fact and Artifact! Spore Giardia troph Giardia cyst T. hominis 31
32 Consequences of Giardiasis Trophozoites colonize the upper intestine & penetrate the mucosa and attach to the underlying epithelial cells Infection range from asymptomatic ----severe diarrhea Host factors play a role in the pathogenesis of the organism Usual symptoms are cramps & diarrhea, prolonged infections may result in malabsorption 32
33 Fact or Artifact? 33
34 Fact or Artifact? 34
35 Description Taenia ova hooklets Note the thick radially striated shell, containing a six hooked embryo (oncosphere). This pollen grain has a similar type of shell and could resemble a Taenia sp. Pollen grain 35
36 Fact or Artifact Pencil sketch Pollen grain Taenia ova Triple threat 36
37 Consequences Cysticercus Invaginated scolex Brain tissue Taeniasis or beef tapeworm (T.saginata) Taeniasis or pork tapeworm (T. solium) The eggs are identical for both species. (A)-The eggs of T.solium are infective to humans, and may cause human cysticercosis if ingested. 37
38 Consequences Close up view of a Cysticerci caused by T. solium. It can measure up to 1 cm in diameter Any body tissue can harbour the cysticerci(cerebral is the most common. site). 38
39 Fact? 39
40 Fact? 40
41 Pencil Sketch A. Plasmodium falciparum rings: multiple rings per cell are typical of P. falciparum than the other species of malaria B. Babesia rings: Maltese cross arrangement when present is diagnostic for Babesia sp. 41
42 Fact or Artifact? platelet Babesia sp. P. falciparum gametocyte 42
43 Consequences of Malaria Malaria caused by Plasmodium falciparum can be a life threatening disease. It is considered a medical emergency, and it is necessary to facilitate rapid and proper laboratory diagnosis. The potential fatal outcome is related to cerebral malaria and multiorgan failure. It is essential to distinguish between P.falciparum and the non-falciparum species due to specific therapeutic needs. Especially the wide spread drug resistance among P.falciparum strains. 43
44 Fact or Artifact? 44
45 Fact? 45
46 All Fact! Cyst Group of mature cysts Starshaped cyst acanthopodia trophozoite 46
47 Consequences of Acanthamoeba Infection Contact lens wearer showing early stage of infection 47
48 Consequences of Acanthamoeba Infection Final outcome can be loss of sight 48
49 Consequences of Acanthamoeba Infection Acanthamoeba isolates vary in sensitivity to antimicrobial agents Sight can be lost in spite of combination drug therapy A corneal transplant in this eye is the final attempt to restore sight. 49
50 Acknowledgments Clinical pictures are from the archives of : The University of Alberta & The University of Alberta Hospital ASCP Pencil Sketches are from the ASM Manual Thanks to Dr s Kinga Kowalewska-Grochowska &Aaron Lee for their assistance. 50
51 Fact or Artifact can you identify this? 51
52 Answer: Fact! Broken Ascaris lumbricoides ova 52
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