MYCOLOGY & VIROLOGY PRE-TEST

All of the following are examples of appropriate

specimens for the recovery of fungi except:

Tissue biopsy

CSF

Aspirate of exudate

Swab

Swab

For which clinical specimens is the KOH direct

mount technique for examination of fungal

elements used?

Skin

Blastoconidia are the beginning of which

structures?

Pseudohyphae

The India ink stain is used as a presumptive test for the presence of which organism?

Crytococcus neoformans in CSF

Which of the following yeast enzymes is detected using birdseed (niger seed) agar?

Phenol oxidase

Dimorphic fungi are found in the infected tissue in which form?

Yeast phase

The mycelial form of which dimorphic mold produces thick-walled, rectangular, or barrel-shaped alternater athroconidia?

Coccidioides immitis

The yeast form of which dimorphic fungus appears as oval or elongated cigar shaped, some with multiple buds?

Sporothrix schenckii

The yeast form of which dimorphic mold shows a large parent yeast cell surrounded by smaller budding yeast cells

Paracoccidioides brasiliensis

Tinea versicolor is a skin infection caused by:

Malassezia furfur

Which Trichophyton sp. causes the favus type of tinea capitis seen in Scandinavian countries and in the Appalachian region of the United States?

T. schoenleinii

The hair baiting test is used to differentiate which two species of Trichophyton that produce red colonies on

Sabouraud’s agar plates?

T. mentagrophytes and T. rubrum

Which virus is the most common etiological agent of viral respiratory diseases in infants and children?

Respiratory syncytial virus

Which virus belonging to the Reoviridae group causes gastroeneteritis in infants and young children but asymtomatic infection in adults?

Rotavirus

A very small, single-stranded DNA virus that causes a febrile illness with a rash and is called the fifth childhood disease after rubeola, rubella, varicella and roseola is:

Parvovirus B19

Which technique is most widely used for the confirmation of infection with human immunodeficiency virus (HIV)?

Western blot assay

The Epstein-Barr virus is associated with which of the following?

Burkitt’s lymphoma

Which of the following structures is invaded by

the genus Trichophyton?

Hair

Nails

Skin

All of these options

All of these options

Which Microsporum species causes an epidemic

form of tinea capitis in children?

Microsporum audouinii

The Hair Baiting Test is used to differentiate

which two species of Trichophyton that produce

red colonies on Sabouraud agar plates?

T. mentagrophytes and T. rubrum

A mold that produces colonies with a dark brown,

green-black, or black appearance of both the

Dematiaceous mold

Which Aspergillus species, recovered from sputum

or bronchial mucus, is the most common cause of

pulmonary aspergillosis?

A. fumigatus

What is the most common cause of mucormycosis

infection in humans?

Rhizopus spp.

Classification of viruses is made by:

Nucleic acid composition

The most common viral syndrome of pericarditis,

myocarditis, and pleurodynia (pain upon

breathing) is caused by:

Coxsackie B virus

The most common causes of viral pneumonia in

adults are:

Influenza and adenovirus

What kind of material is used for nasopharyngeal swab?

Flocked nylon

If delay in viral samples testing occurs, in what dilution should the specimen be kept?

1:3

A toxin associated with Aspergillus

Aflatoxin

Unique biochemical characteristic of Erysipelothrix rhusiopathiae that differentiates it from other non-spore forming, non-branching, catalase negative bacilli.

H2S (+)

Blastoconidia are the beginning of which structures?

Pseudohyphae

First step to be performed in the identification of an unknown yeast isolate?

Germ tube test

Actinomyces israelli causes?

Lumpy jaw

Herpes virus is transmitted through

contact

An appropriate specimen

Folley catheter tip for aerobic culture

Rectal swab for gonorrhea

Swab specimen for dermatophytes

Urine for afb culture

Urine for afb culture

What is the best protection to be used for serious infections transmitted by aerosol droplet?

N95

An outbreak of hepatitis A infection occurred after a meal in a certain restaurant. What is the most probable reason for this outbreak?

Food handler not washing hands after having a CR break

Improper storage of food ingredients

Failure to practice handwashing of the customers

Not observing proper etiquettes when sneezing

Food handler not washing hands after having a CR break

Method used to investigate and identify the organism responsible for a particular food-poisoning outbreak.

Phage typing

An organism capable for growth in a cold environment

Psychrophile

Why is a second dengue infection worse than the first?

Infection with other serotypes

Which of the following is NOT used to describe the colony morphology of fungal cultures?

Verrucose

Rugose

Umbonate

Glaborous

Glaborous

Which disease listed is NOT an STD?

Chancroid

Hand-foot-mouth disease

Urethritis

Ectoparasitic latum

Hand-foot-mouth disease

Which fungal infection attacks macroophages in the lung and causes bloody sputum in 5 percent of cases?

Crytococcosis

Hepatitis B virus can be transmitted by:

Acupuncture

Tattoos

Sexual contact

All of these options

All

Within ____ of collection, specimens must be transported already to the laboratory.

2 hours

The specimen was received in a fixative (formalin)

Reject

Clear halos against a dark background

India Ink Positive Result

Positive for Cryptococcus neoformans

Both statements are true

Both statements are false

Both statements are true

Grows on SDA with oil

M. furfur

The genome and its protective protein coat.

Nucleocapsid

Viral Replication Steps in order

Adsorption, Penetration, Uncoating , Synthesis , Assembly, Release