Question 1

Which of the following skin lesions is characterized as a small, fluid-filled blister, and what is its clinical significance in diagnosing microbial diseases?

Accepted Answer

Vesicle; may indicate either a localized skin infection or a systemic disease

Question 2

Staphylococcus aureus is a major cause of skin infections. Which virulence factor is responsible for the symptoms of scalded skin syndrome, and what is the mechanism?

Accepted Answer

Exfoliative toxin; causes the outer layers of skin to peel off

Question 3

A patient presents with a localized region of pus surrounded by inflamed tissue, which is difficult to treat and may lead to systemic infection. What is the most likely diagnosis?

Accepted Answer

Furuncle

Question 4

Which of the following is NOT a virulence factor produced by Streptococcus pyogenes (Group A, β-hemolytic Strep)?

Accepted Answer

Exfoliative toxin

Question 5

Impetigo is a highly contagious skin infection. Which statement best describes its clinical presentation and transmission?

Accepted Answer

It presents as pustules that rupture and crust, and is spread by direct contact

Question 6

Necrotizing fasciitis is a severe infection caused by invasive Group A Streptococci. Which virulence factor plays a key role in tissue destruction, and what is the typical mortality rate in the US?

Accepted Answer

Exotoxin A; 20-50% mortality

Question 7

Pseudomonas aeruginosa is a concern in burn units due to its resistance. What structural feature contributes to its antimicrobial resistance and persistence in clinical settings?

Accepted Answer

Biofilm production

Question 8

Which treatment for acne is teratogenic and should be avoided in pregnant women?

Accepted Answer

Isotretinoin (Accutane)

Question 9

A patient develops warts due to uncontrolled growth of skin cells. Which virus is most commonly responsible, and what is a common treatment method?

Accepted Answer

Papillomavirus; cryotherapy with liquid nitrogen

Question 10

Smallpox was eradicated in 1977. Which factor was most critical in its eradication?

Accepted Answer

Aggressive vaccination programs and no animal reservoir

Question 11

Chickenpox and shingles are caused by the same virus. What is the name of this virus, and what is a frequent complication of shingles?

Accepted Answer

Varicella-zoster virus; postherpetic neuralgia

Question 12

Reye's syndrome is a serious complication associated with chickenpox and influenza. Which medication increases the risk of developing Reye's syndrome?

Accepted Answer

Aspirin

Question 13

Herpes simplex virus 1 (HSV-1) is most commonly transmitted by which route, and what is a possible severe complication of both HSV-1 and HSV-2 infections?

Accepted Answer

Oral and respiratory routes; encephalitis

Question 14

Measles (Rubeola) is diagnosed by the presence of which oral lesion, and what is the recommended vaccination schedule for children?

Accepted Answer

Koplik's spots; initial vaccination at 12-15 months, booster at 4-6 years

Question 15

Rubella infection during the first trimester of pregnancy can lead to which syndrome, and what are its possible outcomes?

Accepted Answer

Congenital rubella syndrome; deafness, heart defects, cataracts, mental delays, death

Question 16

Ringworm (Tinea) is a fungal infection that can affect various body sites. Which species is most commonly involved, and what is a typical treatment?

Accepted Answer

Dermatophytes; topical ointments

Question 17

Candidiasis may become systemic in immunosuppressed individuals. What is the most severe form called, and what is the typical outcome if untreated?

Accepted Answer

Fulminating disease; death

Question 18

Scabies is caused by an arthropod that burrows under the skin. What is the name of the mite, and what is a recommended treatment for resistant cases?

Accepted Answer

Sarcoptes scabiei; oral ivermectin

Question 19

Which protozoan is associated with keratitis in contact lens wearers, and where is it commonly found?

Accepted Answer

Acanthamoeba; fresh water, hot tubs, soil

Question 20

Trachoma is the leading cause of blindness worldwide. What is the etiologic agent, and what is the recommended treatment?

Accepted Answer

Chlamydia trachomatis; tetracycline

Microbial Diseases of the Skin and Eyes: Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards