Question 1

A patient presents with red, swollen, painful skin lesions after working out at a gym. Laboratory tests reveal Gram-positive cocci resistant to β-lactam antibiotics. Which of the following is the most likely causative agent?

Accepted Answer

Staphylococcus aureus (MRSA)

Question 2

Which of the following diseases is characterized by a maculopapular rash, Koplik spots in the mouth, and is transmitted via airborne particles with extremely high contagiousness?

Accepted Answer

Measles (Rubeola)

Question 3

A child develops honey-colored crusted lesions on the face after playing with other children. Which organism is most likely responsible, and what is the recommended initial treatment?

Accepted Answer

Streptococcus pyogenes; topical antibiotics

Question 4

Which of the following statements about the pathogenesis of chickenpox is correct?

Accepted Answer

The virus remains latent in nerve ganglia and can reactivate later in life.

Question 5

A patient presents with painful vesicular lesions distributed along a single dermatome. Which vaccine could have prevented this condition?

Accepted Answer

Shingrix vaccine

Question 6

Which of the following diseases is NOT highly contagious and is caused by a yeast that feeds on skin oils?

Accepted Answer

Tinea versicolor

Question 7

A newborn is diagnosed with congenital rubella syndrome. Which of the following best explains the pathogenesis of rubella in this scenario?

Accepted Answer

Rubella virus crosses the placenta, causing birth defects.

Question 8

Which of the following diseases is characterized by lesions that are all in the same stage and has been eradicated by vaccination?

Accepted Answer

Smallpox

Question 9

A patient presents with ring-shaped, itchy lesions on the scalp. Which organism is most likely responsible, and what is the best initial treatment?

Accepted Answer

Trichophyton; antifungal cream

Question 10

Which of the following diseases is transmitted primarily by respiratory droplets and is extremely contagious, but can be prevented by the MMR vaccine?

Accepted Answer

Measles

Question 11

A patient develops a mild rash and swollen lymph nodes after exposure to respiratory droplets. Which disease is most likely, and what is the recommended prevention?

Accepted Answer

Rubella; MMR vaccine

Question 12

Which of the following equations best represents the probability $$P of $$transmission for a disease with extremely high contagiousness, given $$n$$ contacts and a transmission rate $$r$$ per contact?

Accepted Answer

$$P = 1 - e$$^{-nr}$$

Question 13

A patient with a history of chickenpox develops painful, one-sided vesicular lesions years later. Which of the following best explains the pathogenesis?

Accepted Answer

The virus reactivates from nerve ganglia, causing shingles.

Question 14

Which of the following is a distinguishing feature of impetigo compared to other skin infections?

Accepted Answer

Honey-colored crusted lesions

Question 15

Which of the following diseases is caused by a fungus that digests keratin and can affect the nails?

Accepted Answer

Tinea unguium

Question 16

A patient presents with skin discoloration in the form of light and dark patches, but the condition is not contagious. Which organism is most likely responsible?

Accepted Answer

Malassezia

Question 17

Which of the following diseases is most likely to be contracted in a hospital setting due to direct contact and is resistant to many antibiotics?

Accepted Answer

MRSA

Question 18

Which of the following is the best prevention strategy for impetigo in children?

Accepted Answer

Maintaining good hygiene

Question 19

A patient presents with itchy vesicles and fever. The disease is highly contagious and can be prevented by the Varivax vaccine. Which disease is this?

Accepted Answer

Chickenpox

Question 20

Which of the following diseases is transmitted by direct contact, animals, or surfaces, and is characterized by ring-shaped lesions?

Accepted Answer

Ringworm (Dermatophytes)

Infectious Diseases of the Skin: Pathogens, Transmission, and Clinical Features

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