Deck 21: Microbial Diseases of the Skin and Eyes

Question 1

All of the following are transmitted via the respiratory route EXCEPT

A) measles.
B) tinea.
C) smallpox.
D) chickenpox.
E) rubella.

Answer 1

B

Question 2

Which of the following is NOT true of acne?

A) It is often due to the action of Propionibacterium.
B) Antibiotics may be prescribed for moderate cases.
C) It can be treated by eliminating fatty foods from the diet.
D) Drugs that inhibit sebum formation are useful in treating inflammatory acne.
E) Mild cases are treated with topical agents.

Answer 2

C

Question 3

Warts are caused by

A) poxvirus.
B) herpesvirus.
C) Staphylococcus aureus.
D) papillomavirus.
E) parvovirus.

Answer 3

D

Question 4

Which region of the skin supports the largest bacterial population?

A) forearms
B) armpits
C) scalp
D) feet
E) All of these support similarly sized bacterial populations.

Question 5

Staphylococcus aureus is responsible for all of the following EXCEPT

A) pimples.
B) acne.
C) carbuncles.
D) sties.
E) boils.

Question 6

All of the following are causative agents of conjunctivitis EXCEPT

A) Chlamydia trachomatis.
B) Haemophilus influenzae.
C) adenovirus.
D) herpes simplex.
E) Neisseria gonorrhoeae.

Question 7

All of the following are normal microbiota of the skin EXCEPT

A) Corynebacterium.
B) Staphylococcus.
C) Micrococcus.
D) Propionibacterium.
E) Streptococcus.

Question 8

An eight-year-old girl has scabs and pus-filled vesicles on her face and throat. Three weeks earlier she had visited her grandmother, who had shingles. What infection does the eight -year-old have?

A) rubella
B) measles
C) scabies
D) fever blisters
E) chickenpox

Question 9

Koplik spots are a diagnostic indicator of

A) chickenpox.
B) fifth disease.
C) rubella.
D) measles.
E) smallpox.

Question 10

Thrush and vaginitis are caused by

A) Candida albicans.
B) Staphylococcus aureus.
C) herpesvirus.
D) Chlamydia trachomatis.
E) Streptococcus pyogenes.

Question 11

All of the following are characteristic of Pseudomonas aeruginosa EXCEPT

A) production of pyocyanin.
B) rod-shaped.
C) gram-positive cell wall.
D) growth in moist environments.
E) resistance to many types of disinfectants and antibiotics.

Question 12

Which of the following cause(s) ringworm?

A) Microsporum
B) Mycobacterium
C) Epidermophyton
D) Microsporum and Epidermophyton
E) Microsporum, Epidermophyton, and Mycobacterium

Question 13

The greatest single cause of blindness in the world is

A) inclusion conjunctivitis.
B) trachoma.
C) pinkeye.
D) keratoconjunctivitis.
E) neonatal gonorrheal ophthalmia.

Question 14

In which of the following respects is measles similar to German measles (rubella)?

A) They have a similar type of rash.
B) They can be controlled by vaccination.
C) Encephalitis is a possible complication.
D) They are caused by the same virus.
E) Congenital complications may occur.

Question 15

A possible complication of chickenpox is

A) fever blisters.
B) macular rash.
C) congenital rubella syndrome.
D) encephalitis.
E) subacute sclerosing panencephalitis.

Question 16

Exfoliative toxin is responsible for

A) thrush.
B) otitis externa.
C) impetigo.
D) fever blisters.
E) scalded skin syndrome.

Question 17

All of the following are protective factors of the skin and its secretions EXCEPT

A) keratin.
B) tightly packed cells.
C) salt.
D) pyocyanin production.
E) lysozyme production.

Question 18

Newbornsʹ eyes are treated with an antibiotic

A) when the mother has gonorrhea.
B) when Neisseria gonorrhoeae is isolated from the eyes.
C) when the mother has genital herpes.
D) when the mother is blind.
E) as a routine precaution.

Question 19

Which of the following is a subcutaneous mycosis?

A) sporotrichosis.
B) Buruli ulcer.
C) athleteʹs foot.
D) erysipelas.
E) tinea capitis.

Question 20

All of the following are characteristic of the Group A beta-hemolytic streptococci EXCEPT

A) methicillin resistance.
B) the ability to dissolve blood clots.
C) M proteins.
D) hyaluronidase production.
E) the ability to damage cell membranes.

Question 21

Which of the following statements about congenital rubella syndrome is FALSE?

A) It is contracted during the first trimester of pregnancy.
B) It does not occur with subclinical infections.
C) It may result in deafness, blindness, and mental retardation.
D) It can be prevented by vaccinating women prior to pregnancy.
E) It may be fatal to the unborn child.

Question 22

Which of the following are incorrectly matched?

A) herpes zoster - shingles
B) poxvirus - fever blisters
C) HHV-6 - roseola
D) varicella-zoster - chickenpox
E) parvovirus - fifth disease

Question 23

Which of the following is NOT caused by HSV-1?

A) herpes gladiatorum
B) herpes encephalitis
C) canker sores
D) cold sores
E) herpes whitlow

Question 24

Scabies is transmitted by

A) food.
B) fomites.
C) soil.
D) respiratory secretions.
E) water.

Question 25

Which of the following is used to treat herpetic keratitis?

A) sulfonamide
B) acyclovir
C) trifluridine
D) penicillin
E) fungicide

Question 26

The patient has vesicles and scabs over her forehead. Microscopic examination of skin scrapings shows gram-positive cocci in clusters. The etiology is

A) Sarcoptes.
B) Microsporum.
C) Staphylococcus aureus.
D) Candida.
E) Pseudomonas aeruginosa.

Question 27

A patient has pus-filled vesicles and scabs on her face, throat, and lower back. She most likely has

A) rubella.
B) mumps.
C) measles.
D) smallpox.
E) chickenpox.

Question 28

A 45-year-old man has pus-filled vesicles distributed over his back in the upper right quadrant, over his right shoulder, and upper right quadrant of his chest. His symptoms are most likely due to

A) Candida albicans.
B) herpes simplex virus.
C) Streptococcus pyogenes.
D) Staphylococcus aureus.
E) varicella-zoster virus.

Question 29

Scabies is a skin disease caused by a

A) slow virus.
B) mite.
C) protozoan.
D) bacterium.
E) prion.

Question 30

The patient has a papular rash. Microscopic examination of skin scrapings reveals small eight-legged animals. The etiology is

A) Staphylococcus aureus.
B) Sarcoptes.
C) Microsporum.
D) Candida.
E) Pseudomonas aeruginosa.

Question 31

Which of the following leads to all the others?

A) staphylococcal infection
B) toxemia
C) sudden drop in blood pressure
D) scalded skin syndrome
E) TSST-1

Question 32

The eradication of smallpox was possible because

A) it can be prevented with the same vaccine used to prevent chickenpox.
B) it was a relatively mild disease.
C) there are no animal reservoirs of the virus.
D) it occurs only in the tropics.
E) insect vectors were eliminated.

Question 33

Which of the following statements about Reye syndrome is FALSE?

A) It is associated with aspirin use.
B) Symptoms may include vomiting, drowsiness, or behavior changes.
C) It is a complication that may occur in chickenpox infection.
D) Prolonged neurological problems may occur.
E) It mostly affects older adults.

Question 34

Which of the following is used to treat candidiasis of the skin or mucous membranes?

A) trifluridine
B) penicillin
C) acyclovir
D) miconazole
E) sulfonamide

Question 35

Which of the following is used to treat sporotrichosis?

A) oral potassium iodide
B) trifluridine
C) sulfonamide
D) penicillin
E) acyclovir

Question 36

The patient has scaling skin on his fingers. Conidiospores are seen in microscopic examination of skin scrapings. The etiology is

A) Candida.
B) Microsporum.
C) Staphylococcus aureus.
D) Mycobacterium ulcerans.
E) Pseudomonas aeruginosa.

Question 37

A 35-year-old woman has a red, raised rash on the inside of her thighs. Gram -stained skin scrapings show large budding cells with pseudohyphae. The infection is caused by

A) herpes simplex virus.
B) Streptococcus pyogenes.
C) varicella-zoster virus.
D) Candida albicans.
E) Staphylococcus aureus.

Question 38

Why is vaccination for rubella recommended?

A) It is no longer recommended; rubella has been eradicated.
B) Health care workers have a high incidence of infection.
C) Death from secondary infections is common.
D) There is a high incidence of congenital infections and birth defects.
E) It has a high mortality rate in school-age children.

Question 39

Buruli ulcer is caused by

A) a virus.
B) a mite.
C) a fungus.
D) gram-positive bacteria.
E) acid-fast bacteria.

Question 40

Which of the following is used to treat shingles?

A) trifluridine
B) acyclovir
C) fungicide
D) penicillin
E) sulfonamide

Question 41

Which of the following pairs is mismatched?

A) Buruli ulcer - Mycobacterium
B) keratitis - Acanthamoeba
C) otitis externa - Pseudomonas
D) chickenpox - poxvirus
E) conjunctivitis - Chlamydia trachomatis

Question 42

Haemophilus influenzae is the most common bacterial cause of pinkeye.

Question 43

Candidiasis often occurs following antibiotic therapy for bacterial infections.

Question 44

Inflammation of the thin clear membrane lining the eyelid and eye is properly termed

A) keratititis
B) trachoma
C) ophthalmia neonatorum
D) whitlow
E) conjunctivitis

Question 45

Which of the following is incorrectly matched?

A) Neisseria gonorrhea - opthalmia neonatorum
B) Pseudomonas - inclusion conjunctivitis
C) Acanthamoeba - keratitis
D) Haemophilus influenzae - pinkeye
E) Chlamydia trachomatis - trachoma

Question 46

Blue-green pus is characteristic of Pseudomonas wound infections.

Question 47

Acanthamoeba infections are usually transmitted via insects.

Question 48

The normal flora of the skin is predominantly gram -negative rods.

Question 49

The abbreviation ʺGASʺ refers to pathogenic strains of Staphylococcus.

Question 50

Assume that your lab partner swabs the side of his face and uses the swab to inoculate a nutrient agar plate. The next day, he performs a Gram stain on the colonies. They are gram -positive cocci. You advise him that he should next look for

A) an acid-fast reaction.
B) pseudopods.
C) a coagulase reaction.
D) conidiospores.
E) pseudohyphae.

Question 51

A 17-year-old boy has pus-filled cysts on his face and upper back. Microscopic examination reveals gram-positive rods. This infection is caused by

A) Propionibacterium acnes.
B) Acanthamoeba.
C) Staphylococcus aureus.
D) herpes simplex virus.
E) Streptococcus pyogenes.

Question 52

Infection with Pediculus humanus is called scabies.

Question 53

The varicella-zoster virus is the causative agent of chickenpox and shingles.

Question 54

The majority of the staphylococci isolated from human skin are coagulase-positive.

Question 55

Which of the following is likely to spread MRSA among athletes?

A) physical contact
B) taping gels
C) shared equipment
D) whirlpool baths
E) All of the answers are correct.

Question 56

Pathogens of the skin often enter via hair follicles and ducts of the sweat glands.