Question 1

MATCHING
Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once.
-P.ovale

Accepted Answer

A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval 
A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval D

Question 2

Match the vector with the organism it infects. Answers may be used more than once.
-T.brucei gambiense

Accepted Answer

A) Anopheles mosquito 
B) Tsetse fly 
C) Sandfly 
D) Reduviid bug 
A) Anopheles mosquito 
B) Tsetse fly 
C) Sandfly 
D) Reduviid bug B

Question 3

Humans contract Chagas disease when the reduviid bug defecates while taking a blood meal and the parasites in the feces are rubbed or scratched into the bite wound or onto mucosal surfaces.Which stage in the blood infects the host cells?

Accepted Answer

A)  Amastigote 
B)  Epimastigote 
C)  Trypomastigote 
D)  Promastigote 
A)  Amastigote 
B)  Epimastigote 
C)  Trypomastigote 
D)  Promastigote C

Question 4

MATCHING
Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once.
-P.malariae

Accepted Answer

A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval 
A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval

Question 5

Resistance to chloroquine and mefloquine has been identified in which Plasmodium spp.?

Accepted Answer

A)  P. ovale 
B)  P. vivax 
C)  P. falciparum 
D)  P. malariae 
A)  P. ovale 
B)  P. vivax 
C)  P. falciparum 
D)  P. malariae

Question 6

A thick ring, large nucleus, and bands across the cell and 6 to 12 merozoites in a mature schizont are all characteristics of which Plasmodium spp.?

Accepted Answer

A)  P. vivax 
B)  P. ovale 
C)  P. falciparum 
D)  P. malariae 
A)  P. vivax 
B)  P. ovale 
C)  P. falciparum 
D)  P. malariae

Question 7

Ring forms and a "Maltese cross" were observed in a blood smear.The vector that transmits this disease is a(n):

Accepted Answer

A)  tick. 
B)  tsetse fly. 
C)  anopheles mosquito. 
D)  sandfly. 
A)  tick. 
B)  tsetse fly. 
C)  anopheles mosquito. 
D)  sandfly.

Question 8

Delicate ring forms and crescent-shaped gametocytes are the only forms normally observed in the peripheral blood of which Plasmodium spp.?

Accepted Answer

A)  P. vivax 
B)  P. malariae 
C)  P. falciparum 
D)  P. ovale 
A)  P. vivax 
B)  P. malariae 
C)  P. falciparum 
D)  P. ovale

Question 9

MATCHING
Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once.
-P.falciparum

Accepted Answer

A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval 
A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval

Question 10

MATCHING
Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once.
-P.knowlesi

Accepted Answer

A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval 
A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval

Question 11

Stage I of trypanosomiasis characteristically involves systemic trypanosomiasis infection without central nervous system (CNS)involvement.Lymphadenopathy is also a feature of this disease.The trypomastigotes of which protozoa are involved?

Accepted Answer

A)  Trypanosoma cruzi 
B)  T. rangeli 
C)  T. brucei rhodesiense 
D)  T. brucei gambiense 
A)  Trypanosoma cruzi 
B)  T. rangeli 
C)  T. brucei rhodesiense 
D)  T. brucei gambiense

Question 12

MATCHING
Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once.
-Plasmodium vivax

Accepted Answer

A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval 
A) Normal shape and size 
B) Normal shape; size may be normal or slightly smaller 
C) 1.5 to 2.0 times larger than normal; oval to normal 
D) 60% of cells are larger than normal and oval

Question 13

Match the vector with the organism it infects. Answers may be used more than once.
-T.rangeli

Accepted Answer

A) Anopheles mosquito 
B) Tsetse fly 
C) Sandfly 
D) Reduviid bug 
A) Anopheles mosquito 
B) Tsetse fly 
C) Sandfly 
D) Reduviid bug

Question 14

The most frequent clinical signs of chronic Chagas disease involve the enlargement of which organ?

Accepted Answer

A)  Heart 
B)  Liver 
C)  Spleen 
D)  Lung 
A)  Heart 
B)  Liver 
C)  Spleen 
D)  Lung

Question 15

Cerebral malaria is considered to be the most serious complication and major cause of death with which species of Plasmodium spp.?

Accepted Answer

A)  P. vivax 
B)  P. falciparum 
C)  P. ovale 
D)  P. malariae 
A)  P. vivax 
B)  P. falciparum 
C)  P. ovale 
D)  P. malariae

Question 16

Match the vector with the organism it infects. Answers may be used more than once.
-Trypanosoma cruzi

Accepted Answer

A) Anopheles mosquito 
B) Tsetse fly 
C) Sandfly 
D) Reduviid bug 
A) Anopheles mosquito 
B) Tsetse fly 
C) Sandfly 
D) Reduviid bug

Question 17

Match the vector with the organism it infects. Answers may be used more than once.
-T.brucei rhodesiense

Accepted Answer

A) Anopheles mosquito 
B) Tsetse fly 
C) Sandfly 
D) Reduviid bug 
A) Anopheles mosquito 
B) Tsetse fly 
C) Sandfly 
D) Reduviid bug

Question 18

In Trypanosoma brucei rhodesiense trypanosomiasis infections, CNS invasion occurs early.The disease progresses rapidly, and death may occur before extensive CNS involvement.Inflammation of which organ is more common and severe with this disease form?

Accepted Answer

A)  Kidney 
B)  Lungs 
C)  Liver 
D)  Heart 
A)  Kidney 
B)  Lungs 
C)  Liver 
D)  Heart

Question 19

Chagas disease is caused by:

Accepted Answer

A)  Trypanosoma rangeli. 
B)  T. cruzi. 
C)  T. brucei rhodesiense. 
D)  T. brucei gambiense. 
A)  Trypanosoma rangeli. 
B)  T. cruzi. 
C)  T. brucei rhodesiense. 
D)  T. brucei gambiense.

Question 20

Plasmodium vivax is suspected in a patient who has been traveling for months in the tropics.Blood was collected in a lavender top tube; however, the slide was not prepared for examination until the next day because the specimen came in on the night shift.Once the slide was prepared and examined, Schüffner dots were not visible.Which one of the following statements explains this discrepancy?

Accepted Answer

A)  Schüffner dots are not characteristic of P. vivax infections. 
B)  The blood film was most likely incorrectly prepared. 
C)  The blood should have been collected in a red top tube. 
D)  The blood remained in the tube too long, yielding false-negative results. 
A)  Schüffner dots are not characteristic of P. vivax infections. 
B)  The blood film was most likely incorrectly prepared. 
C)  The blood should have been collected in a red top tube. 
D)  The blood remained in the tube too long, yielding false-negative results.

Exam 48: Blood and Tissue Protozoa

MATCHING Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once. -P.ovale

Match the vector with the organism it infects. Answers may be used more than once. -T.brucei gambiense

Humans contract Chagas disease when the reduviid bug defecates while taking a blood meal and the parasites in the feces are rubbed or scratched into the bite wound or onto mucosal surfaces.Which stage in the blood infects the host cells?

MATCHING Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once. -P.malariae

Resistance to chloroquine and mefloquine has been identified in which Plasmodium spp.?

A thick ring, large nucleus, and bands across the cell and 6 to 12 merozoites in a mature schizont are all characteristics of which Plasmodium spp.?

Ring forms and a "Maltese cross" were observed in a blood smear.The vector that transmits this disease is a(n):

Delicate ring forms and crescent-shaped gametocytes are the only forms normally observed in the peripheral blood of which Plasmodium spp.?

MATCHING Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once. -P.falciparum

MATCHING Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once. -P.knowlesi

Stage I of trypanosomiasis characteristically involves systemic trypanosomiasis infection without central nervous system (CNS)involvement.Lymphadenopathy is also a feature of this disease.The trypomastigotes of which protozoa are involved?

MATCHING Match the size and shape of the parasitized RBCs as they appear in Giemsa-stained thin blood smears. Answers may be used more than once. -Plasmodium vivax

Match the vector with the organism it infects. Answers may be used more than once. -T.rangeli

The most frequent clinical signs of chronic Chagas disease involve the enlargement of which organ?

Cerebral malaria is considered to be the most serious complication and major cause of death with which species of Plasmodium spp.?

Match the vector with the organism it infects. Answers may be used more than once. -Trypanosoma cruzi

Match the vector with the organism it infects. Answers may be used more than once. -T.brucei rhodesiense

In Trypanosoma brucei rhodesiense trypanosomiasis infections, CNS invasion occurs early.The disease progresses rapidly, and death may occur before extensive CNS involvement.Inflammation of which organ is more common and severe with this disease form?

Chagas disease is caused by:

Microbial Taxonomy

Bacterial Genetics, Metabolism, and Structure

Host-Microorganism Interactions

Laboratory Safety

Specimen Management

Role of Microscopy

Traditional Cultivation and Identification

Nucleic Acid-Based Analytic Methods for Microbial Identification and Characterization

Immunochemical Methods Used for Organism Detection

Serologic Diagnosis of Infectious Diseases

Principles of Antimicrobial Action and Resistance

Laboratory Methods and Strategies for Antimicrobial Susceptibility Testing

Staphylococcus Micrococcus and Similar Organisms

Streptococcus Enterococcus and Similar Organisms

Bacillus and Similar Organisms

Listeria Corynebacterium and Similar Organisms

Erysipelothrix Lactobacillus and Similar Organisms

Nocardia Streptomyces Rhodococcus and Similar Organisms

Enterobacteriaceae

Acinetobacter, Stenotrophomonas, and Other Organisms

Pseudomonas, Burkholderia, and Similar Organisms

Rhizobium, Ochrobactrum, and Similar Organisms

Chryseobacterium, Sphingobacterium, and Similar Organisms

Alcaligenes, Bordetella Nonpertussis, Comamonas, and Similar Organisms

Vibrio, Aeromonas, Chromobacterium, and Related Organisms

Sphingomonas Paucimobilis and Similar Organisms

Moraxella and Related Organisms

Eikenella and Similar Organisms

Pasteurella and Similar Organisms

Actinobacillus, Aggregatibacter, Kingella, Cardiobacterium, Capnocytophaga, and Similar Organisms

Haemophilus

Bartonella and Afipia

Campylobacter, Arcobacter, and Helicobacter

Legionella

Brucella

Bordetella Pertussis, Bordetella Parapertussis, and Related Species

Francisella

Streptobacillus Moniliformis and Spirillum Minus

Neisseria and Moraxella Catarrhalis

Overview and General Considerations

Overview of Anaerobic Organisms

Mycobacteria

Obligate Intracellular and Non-culturable Bacterial Agents

Cell Walldeficient Bacteria: Mycoplasma and Ureaplasma

The Spirochetes

Laboratory Methods for Diagnosis of Parasitic Infections: Overview

Intestinal Protozoa

Other Protozoa

Intestinal Nematodes Roundworms

Tissue Nematodes Roundworms

Blood and Tissue Filarialnematodes

Intestinal Cestodes

Tissue Cestodes

Intestinal Trematodes

Liver and Lung Trematodes

Blood Trematodes

Overview of Fungal Identification Methods and Strategies

Hyaline Molds, Mucorales Zygomycetes, Dermatophytes, and Opportunitistic and Systemic Mycoses

Dematiaceous Melanizedmolds

Opportunistic Atypical Fungus: Pneumocystis Jiroveci