All of the following Mycobacterium spp. produce the enzyme required to convert niacin to niacin ribonucleotide except:

Which nonpathogenic Mycobacterium sp. is isolated most often from clinical specimens and is called the “tapwater bacillus”?

Which of the following Mycobacterium spp. would be most likely to grow on MacConkey agar plate?

For which clinical specimens is the potassium hydroxide direct mount technique for examination of fungal elements used?

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

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

Which of the following yeasts is characteristically positive for germ tube production?

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

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

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

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

Tinea versicolor is a skin infection caused by:

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

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

Sabouraud’s agar plates?

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

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

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:

Which virus is associated with venereal and respiratory tract warts and produces lesions of the skin and mucous membranes?

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

The infective stage is the sheathed filariform larva:

All of the following larva migrate through the lungs except one:

Habitat of the adult Trichinella spiralis:

The adult female is characterized by having a barber’s pole appearance due to the looping of the whitish uterus around the reddish digestive tract:

Visceral larva migrans is associated with this organism:

Nematode parasite thought to have been the “fiery serpent” of the ancient Israelites. This parasite, which has various species of Cyclops as its intermediate host, is:

A dog parasite that almost never develops to an adult in humans has been found in some persons as a cause of a subcutaneous nodule or a solitary peripheral nodule in the lung. This nematode is:

Microcytic anemia is associated with this parasite:

Suitable specimen for the identification of microfilaria:

Which of the following microfilariae is unsheathed?

Eye worm producing fugitive swelling or Calabar swelling:

Rhabditiform larva with purposeless motion and short buccal cavity:

Operculated ovum containing a miracidium and can appear in sputum, often accompanied by blood and Charcot Leyden crysrtals:

Eggs of this fluke are small and shaped like an old-fashioned electric light bulb:

A soil and water amoeba isolated from cases of meningoencephalitis:

This is diagnostic of Entamoeba histolytica if present in the amoebic trophozoite:

The string test (Entero-Test) for obtaining a small specimen of duodenal contents for parasitic infection would be most appropriate for:

Largest and the most robust Trichomonas sp.:

Mature and gravid proglottids are typically shaped like melon seeds:

Cysticercosis is caused by the disseminated larva of:

Almond-shaped scolex with two lateral grooves:

Chagas’ disease is caused by:

Xenodiagnosis is usually performed for the diagnosis of:

Asexual development and multiplication of malarial parasites:

Asexual life cycle of malaria parasite occur in:

Stage predominantly seen in the smear is the band form of the developing trophozoite:

Causes blackwater fever:

Plasmodium sp which has an affinity for mature or older red blood cells:

Culture of a finger wound specimen from a meat packer produced short gram-positive bacilli on a blood agar plate with no hemolysis. Given the following test results at 48 hours, what is the most likely identification?

Catalase 0

Motility (wet prep) 0

H₂S (TSI) +

Gelatin stab Bottle brush growth

The bile solubility test causes lysis of: