Question 1

Identify the following:  &#10;A) Ascaris lumbricoides&#10;B) Strongyloides stercoralis&#10;C) Hookworm&#10;D) Schistosoma haematobium

Accepted Answer

The usual diagnostic stage is the egg.Fertile Ascaris eggs are oval,measure 45 to 75 by 35 to 50 mm,and have thick hyaline walls surrounding a one-cell-stage embryo.Most eggs have a brown,bile-stained mammillated outer layer.CDC PHIL #10584

Question 2

Identify the following:  &#10;A) Plasmodium ovale&#10;B) P. vivax&#10;C) P. falciparum&#10;D) P. malariae

Accepted Answer

The trophozoite of P.malariae is compact and may assume a characteristic "band" appearance,in which it stretches across the diameter of the red blood cells (RBCs).Dark,coarse brown-black pigment is present.Occasionally,a few pink cytoplasmic dots,called Ziemann's dots,may be seen.The mature schizont contains 6 to 12 merozoites with an average of 8.Merozoites may be arranged in a characteristic loose daisy petal arrangement around the clumped pigment.CDC PHIL # 5130

Question 3

Identify the following:  &#10;A) Leishmania donovani&#10;B) Babesia microti&#10;C) Plasmodium falciparum&#10;D) Trypanosoma cruzi

Accepted Answer

The primary diagnostic stage in the blood is the trypomastigote.It is an elongated structure 15 to 20 mm long that often appears in a C or U shape.Like the other trypomastigotes,it shows a single large nucleus midbody and a posterior kinetoplast to which is attached the undulating membrane.The morphology of all trypomastigotes is similar; therefore a complete patient history is necessary to determine the species present.CDC PHIL #3013

Question 4

Identify the following:  &#10;A) Plasmodium ovale&#10;B) P. malariae&#10;C) P. falciparum&#10;D) P. vivax

Accepted Answer

The ring forms of P.falciparum are more delicate than those of other species and often have two chromatin dots.Applique forms,parasites on the edge of the red blood cells (RBC),and multiple ring forms in a single RBC are common.The mature trophozoite is small and compact and may have dark brown pigment.The schizont has 8 to 36 merozoites,with an average of 20 to 24.Gametocytes have a characteristic banana or crescent shape.CDC PHIL # 5941

Question 5

Identify the following:  &#10;A) Leishmania donovani&#10;B) Wucheria bancrofti&#10;C) Trichinella spiralis&#10;D) Loa loa

Accepted Answer

Because it is difficult to recover adults or larvae in a stool sample,the diagnosis is often based on clinical symptoms and the patient's history.Biopsy of muscle tissue and identification of encapsulated,coiled larva is the definitive diagnostic method.CDC PHIL #10142

Question 6

Identify the following:  &#10;A) Cryptosporidium parvum&#10;B) Isospora belli&#10;C) Cyclospora cayetanensis&#10;D) Encephalitozoon intestinalis

Accepted Answer

The recommended detection methods when Cryptosporidium infection is suspected are the modified Ziehl-Nielsen acid-fast stain and an immunofluorescent antibody test using a monoclonal antibody directed against Cryptosporidium.With the acid-fast stain,the organism stains as a bright red sphere that distinguishes it from yeasts,which stain green.CDC PHIL #5242

Question 7

Identify the following:  &#10;A) Schistosoma mansoni&#10;B) S. japonicum&#10;C) S. haematobium&#10;D) S. madurella

Accepted Answer

S.japonicum eggs are round and 60 to 95 mm by 40 to 60 mm; they have a small,curved,rudimentary spine.CDC PHIL # 4842

Question 8

Identify the following:  &#10;A) Trichuris trichiura&#10;B) Enterobius vermicularis&#10;C) Ascaris lumbricoides&#10;D) Hookworm

Accepted Answer

The adult Enterobius vermicularis female measures 8 to 13 mm long and has a long,pointed tail and three cuticle lips with alae at the anterior end.The egg is oval,colorless,and slightly flattened on one side.It measures approximately 50 to 60 mm by 20 to 30 mm.The egg is usually seen embryonated and containing a C-shaped larvae.CDC PHIL #5229

Question 9

Identify the following:  &#10;A) Entamoeba histolytica/E. dispar&#10;B) E. hartmanni&#10;C) Giardia lamblia&#10;D) E. coli

Accepted Answer

The average size of the E.histolytica/dispar cyst is 10 to 20 mm.Cysts of the organism may have one to four nuclei each with a small central karyosome and fine,evenly distributed peripheral chromatin.The cytoplasm may contain cigar-shaped chromatoidal bars with rounded ends.These bars are composed of ribonucleic acid.CDC PHIL #7831

Question 10

Identify the following:  &#10;A) Wucheria bancrofti&#10;B) Brugia malayi&#10;C) Loa loa&#10;D) Fasciola hepatica

Accepted Answer

The unembryonated and operculated eggs of Fasciola hepatica are carried in the bile to the intestinal tract and are passed in the feces.The size range is 130 to 150 mm by 60 to 90 mm.They are virtually indistinguishable from eggs of F.buski.CDC PHIL #4846

Question 11

Identify the following:  &#10;A) Hymenolepis nana&#10;B) Taenia saginata&#10;C) Diphyllobothrium latum&#10;D) Taenia solium

Accepted Answer

The answer of Identify the following:  &#10;A) Hymenolepis nana&#10;B)...

Question 12

Identify the following:  &#10;A) Schistosoma mansoni&#10;B) Opisthorchis sinensis&#10;C) Fasciola hepatica&#10;D) Heterophyes heterophyes

Accepted Answer

The answer of Identify the following:  &#10;A) Schistosoma mansoni&#10;B)...

Question 13

Identify the following:  &#10;A) Schistosoma mansoni&#10;B) S. japonicum&#10;C) S. haematobium&#10;D) S. madurella

Accepted Answer

The answer of Identify the following:  &#10;A) Schistosoma mansoni&#10;B)...

Question 14

Identify the following:  &#10;A) Plasmodium malariae&#10;B) P. ovale&#10;C) P. falciparum&#10;D) P. vivax

Accepted Answer

The answer of Identify the following:  &#10;A) Plasmodium malariae&#10;B)...

Question 15

Identify the following:  &#10;A) Brugia malayi&#10;B) Loa loa&#10;C) Wucheria bancrofti&#10;D) Onchocerca volvulus

Accepted Answer

The answer of Identify the following:  &#10;A) Brugia malayi&#10;B)...

Question 16

Identify the following:  &#10;A) Plasmodium ovale&#10;B) Babesia microti&#10;C) Plasmodium malariae&#10;D) Trypanosoma cruzi

Accepted Answer

The answer of Identify the following:  &#10;A) Plasmodium ovale&#10;B)...

Question 17

Identify the following:  &#10;A) Trypanosoma spp.&#10;B) Leishmania spp.&#10;C) Wucheria bancrofti&#10;D) Loa loa

Accepted Answer

The answer of Identify the following:  &#10;A) Trypanosoma spp.&#10;B)...

Question 18

Identify the following:  &#10;A) Schistosoma mansoni&#10;B) S. japonicum&#10;C) S. haematobium&#10;D) S. madurella

Accepted Answer

The answer of Identify the following:  &#10;A) Schistosoma mansoni&#10;B)...

Question 19

Identify the following:  &#10;A) Hymenolepis nana&#10;B) Taenia spp.&#10;C) Diphyllobothrium latum&#10;D) Paragonimus westermani

Accepted Answer

The answer of Identify the following:  &#10;A) Hymenolepis nana&#10;B)...

Deck 28: Diagnostic Parasitology