ABPath Medical Microbiology 2

Question 1

A catalase-positive, coagulase-positive gram-positive cocci in clusters is isolated from a wound. Which organism is most likely?

Accepted Answer

Staphylococcus aureus

Answer

Staphylococcus epidermidis

Answer

Streptococcus pyogenes

Answer

Enterococcus faecalis

Question 2

Which stain is used to identify Mycobacterium tuberculosis in sputum?

Accepted Answer

Ziehl-Neelsen (acid-fast)

Answer

Gram stain

Answer

India ink

Answer

Giemsa

Question 3

A patient with meningitis has CSF showing gram-negative diplococci. Which organism is most likely?

Accepted Answer

Neisseria meningitidis

Answer

Streptococcus pneumoniae

Answer

Listeria monocytogenes

Answer

Haemophilus influenzae

Question 4

Which fungus is identified by broad, ribbon-like, aseptate hyphae with wide-angle branching?

Accepted Answer

Mucor (Zygomycetes)

Answer

Aspergillus

Answer

Candida albicans

Answer

Cryptococcus neoformans

Question 5

Which test differentiates Streptococcus pneumoniae from viridans streptococci?

Accepted Answer

Optochin sensitivity

Answer

Bacitracin sensitivity

Answer

Coagulase test

Answer

Oxidase test

Question 6

A febrile patient returning from sub-Saharan Africa has ring forms and banana-shaped gametocytes on blood smear. Diagnosis?

Accepted Answer

Plasmodium falciparum

Answer

Plasmodium vivax

Answer

Babesia microti

Answer

Trypanosoma brucei

Question 7

Which virus is most commonly associated with cervical cancer?

Accepted Answer

Human papillomavirus (HPV)

Answer

Herpes simplex virus type 2

Answer

Epstein-Barr virus

Answer

Cytomegalovirus