Exam 46: Laboratory Methods for Diagnosis of Parasitic Infections: Overview

A 7-year-old girl was at summer camp and dove into the lake many times.She complained that water went up her nose a few times.Several days later she is unresponsive and comatose and rushed to the hospital.A cerebrospinal fluid (CSF)specimen is drawn, and several motile amebae are observed.She is most likely suffering from an infection with which of the following parasites?

A 4-year-old boy who is in day care 3 days per week is irritable and scratching the area around his anus.What morphologic characteristics would most likely be observed on microscopic examination of the appropriate specimen?

Babesia spp.is transmitted via the bite of a tick and can cause severe disease in patients who have been splenectomised or who are immunocompromised.To diagnose accurately these patient populations, the specimen of choice is:

A bone marrow aspirate is examined for the presence of parasites from a patient who has been traveling in Latin America for several months and who came in contact with a triatomid bug.Which parasite will most likely be identified?

Which of the following intestinal parasites is found in humans and also in pigs?

Wuchereria, Brugia, Loa, and Onchocerca are all classified as:

This protozoa has a trophozoite stage but no cyst stage and reproduces via longitudinal binary fission.The parasite belongs to which category?

The Entero-Test capsule technique involves the collection of duodenal contents to examine the presence of which of the following parasites?

The specimen of choice to collect in suspected cases of Paragonimus infection is:

The eggs of which of the following intestinal parasites are not commonly found in feces and must be detected by other diagnostic techniques?

Which of the following is currently the only fixative available that does not contain formalin, polyvinyl alcohol (PVA), or mercury?

Some strains of leishmaniae have reservoir hosts, including dogs and wild rodents.Transmission is via the bite of a:

A urine sample from a 26-year-old woman is examined, and an organism is observed that displays "jerky" motility.This organism is classified as a(n):

A 17-year-old male with a severe eye infection admits that he does not clean his contact lenses as often as he should.His eye infection is most likely the result of which parasite?

A medical laboratory scientist (MLS)is examining a thin blood film from a patient suspected of having a Plasmodium infection.After examining the slide for 5 minutes and viewing approximately 100 oil immersion fields, the MLS does not observe any structures associated with Plasmodium.Which one of the following statements explains this discrepancy?

The concentration protocol of the ova and parasite (O&P)examination:

The PARA-TECT Cryptosporidium/Giardia test kit uses which of the following formats for detection?

The permanent stained smear protocol of the O&P examination:

The parasite Toxoplasma gondii is acquired via the ingestion of infected oocysts from cat feces.A diagnosis is primarily made through:

A modified acid-fast stain is performed on lung tissue.The most likely organism that will be observed is: