Question 1

Which virulence factor produced by Staphylococcus aureus is responsible for inhibiting opsonization by binding to the Fc fragment of antibodies?

Accepted Answer

Protein A

Question 2

A newborn in a hospital nursery develops scalded skin syndrome. Which toxin is most likely responsible for this condition?

Accepted Answer

Exfoliatin

Question 3

Which of the following best describes the mechanism of action of $$	ext{Leukocidin}$$ produced by Staphylococcus aureus?

Accepted Answer

Kills leukocytes by disrupting their membranes

Question 4

Impetigo is most commonly caused by which bacterial species?

Accepted Answer

Streptococcus pyogenes

Question 5

A patient presents with a bullseye rash after a tick bite. Which organism is most likely responsible for this presentation?

Accepted Answer

Borrelia burgdorferi

Question 6

Which stage of Lyme disease is characterized by chronic arthritis and neurological changes such as memory and mood disturbances?

Accepted Answer

Third stage

Question 7

Which of the following is TRUE regarding the treatment of Lyme disease?

Accepted Answer

Antibiotics are only effective during the first stage

Question 8

Which virus is responsible for chickenpox and can later reactivate to cause shingles?

Accepted Answer

Varicella-zoster virus

Question 9

A child develops Koplik spots and a macular rash after an incubation period of 10-12 days. Which virus is most likely responsible?

Accepted Answer

Measles virus (Rubeola)

Question 10

Which of the following statements about Rubella is CORRECT?

Accepted Answer

It can cause congenital rubella syndrome if contracted during pregnancy

Question 11

Human papillomavirus (HPV) is associated with which of the following cancers?

Accepted Answer

Cervical cancer

Question 12

Which of the following treatments is used for cutaneous mycoses such as ringworm and athlete’s foot?

Accepted Answer

Topical creams containing azoles

Question 13

A patient develops oral thrush after a course of antibiotics. Which organism is most likely responsible?

Accepted Answer

Candida albicans

Question 14

Which of the following is a plausible reason why antibiotics may not be effective in the later stages of Lyme disease?

Accepted Answer

The symptoms are due to autoimmunity rather than active infection

Question 15

Which of the following is a characteristic of Propionibacterium acnes in the pathogenesis of acne vulgaris?

Accepted Answer

It eats sebum and grows anaerobically

Question 16

Which of the following is a plausible mechanism by which Staphylococcus aureus can cause abscess formation in hair follicles?

Accepted Answer

Production of coagulase leading to fibrin clot formation

Question 17

Which of the following equations best represents the relationship between the incubation period ($$t) $$and the rate of viral replication ($$r) $$for a virus with exponential growth?

Accepted Answer

$$N(t) = N_0$ e$$^{rt}$$

Question 18

A patient presents with a ring-shaped rash on the arm. Which organism is most likely responsible, and what is the primary nutrient source for this organism?

Accepted Answer

Dermatophyte fungi; keratin

Question 19

Which of the following is a plausible reason why athlete’s foot often occurs in moist areas of the body?

Accepted Answer

Moisture promotes fungal growth and survival

Question 20

Which of the following vaccines is administered as part of the MMRV regime and helps prevent both chickenpox and shingles?

Accepted Answer

Attenuated whole agent varicella vaccine

Microbial Infections of the Skin: Bacterial, Viral, and Fungal Diseases

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