The skin is an effective barrier against invading microbes because
A) the outer layers are dead and covered in salt.
Normal skin microbiota are able to grow on the skin because of their resistance to
A) sebum and salt
An infection of a hair follicle at the base of an eyelid is called a
E) sty
One feature that differentiates Staphylococcus aureus from other staphylococci is its
E) production of both coagulase and beta-lactamase
Virulent strains of Staphylococcus aureus can resist penicillin because they produce
B) beta-lactamase
Which of the following is a complication that may result from a Streptococcus pyogenes skin infection?
B) erysipelas
Impetigo can be caused by
D) both Staphylococcus aureus and Streptococcus pyogenes
Staphylococcal scalded skin syndrome is caused by
C) exfoliative toxins
The common name for a furuncle is
E) a boil
Necrotizing fasciitis is caused by
E) both Streptococcus pyogenes ans Staphylococcus aureus
A specific wavelength of blue light can be used to treat
A) acne
Cat scratch disease is caused by
C) Bartonella henselae
Anthrax derives its name from which of the following aspects of the disease?
A) the appearance of eschars on the skin
The resistance of Pseudomonas to a wide variety of antimicrobial drugs is due, in part, to its
D) ability to pump drugs out of the cell
Petechiae are subcutaneous hemorrhages associated with which of the following?
E) RMSF
Transovarian transmission is a process by which
E) an infected female vector transmits a pathogen to the eggs in its ovaries
What is the pathogenic process underlying Rocky Mountain spotted fever?
E) damage to blood vessels
"Pox" is a term synonymous with which of the following?
A) a pustule
Smallpox was the first human disease to be
B) globally eradicated
Clostridium perfringens is a strict anaerobe that is a common environmental contaminant and consequently of wounds due to its ability to
D) produce endospores
Acyclovir is a chemotherapeutic agent used to treat
C) herpes
Shingles, or herpes zoster, is caused by the same virus that causes
C) chickenpox
Common skin warts are the result of infection with
E) papillomaviruses
Some strains of Papillomavirus are oncogenic due to their ability to
B) integrate into the host cell DNA
Erythema infectiosum is also known as
C) fifth disease
Which of the following can cause birth defects?
C) rubella
Which of the following is an INCORRECT pairing?
E) herpes zoster : genital warts
Which of the following is becoming rarer as a result of childhood vaccinations?
E) subacute sclerosing panencephalitis
"Ringworm" is caused by
C) dermatophytes growing in upper dead tissue layers of the skin
Ultraviolet illumination is the quickest way to diagnose infections of which of the following?
A) Malassezia furfur
Sporotrichosis is more commonly known as
E) rose-gardener's disease
A man is suffering severe foot pain in the area of what looks like a large wart. He reports he has had the wart for some time, and the pain and swelling have developed slowly. A sample from the lesion shows that the pus contains large cells that stain a golden brown color. The man is likely suffering from
A) chromblasomyosis
A child complains of intensely itchy "pimples" on the hands and wrists. The lesions are small inflamed streaks, but do not appear to contain pus. The child's condition may be the result of infection with
A) Sarcoptes scabiei
Which of the following forms of leishmaniasis is typically fatal?
C) visceral
A small puncture wound on a woman's arm has become swollen, hot to the touch, and intensely painful. There is tissue necrosis, but it is not "gassy," and under the microscope Gram-positive cocci in chains are present. Which of the following microbes is likely to be responsible?
D) Streptococcus pyogenes
A pigment produced by an opportunistic pathogen that contributes to tissue damage is
A) pyocyanin
Which of the following is/are anti-phagocytic?
E) protein A, M protein, and lekocidin
Which of the following bacterial pathogens is an intracellular parasite?
E) Bartonella henselae
The rash described as "teardrops on rose petals" is characteristic of
A) chickenpox
A child has a rash on the face, arms, upper legs and torso that is splotchy, and intensifies after being in the sun. The child does not complain of fever or itchiness. The signs and symptoms are consistent with
D) fifth disease
A sample from an abscess is stained and examined under the microscope. A Gram stain appears uniformly pink, but a GMS (Gomori methenamine sliver) stain reveals brownish filaments in the sample. These findings suggest
D) phaeohyphomycosis
Mucocutaneous leishmaniasis, also known as kala-azar, is fatal in 100% of untreated cases.
a) True
b) False
b) False
Clostridium perfringens causes necrotizing fasciitis.
a) True
b) False
b) False
M protein is a virulence factor associated with group A streptococci.
a) True
b) False
a) True
Humans are the only hosts of Rickettsia rickettsii.
a) True
b) False
b) False
Because they are common soil saprobes, dermatophytes are fungi that are not contagious in humans.
a) True
b) False
b) False
Chromoblastomycosis is rarely a severe disease and can be treated easily with appropriate drugs.
a) True
b) False
b) False
Smallpox vaccination was originally discontinued in the 1980's because of adverse effects of the vaccine.
a) True
b) False
a) True
Herpesvirus infections can be controlled with chemotherapeutic agents.
a) True
b) False
a) True
In pregnant women, roseola infection can result in teratogenic birth defects.
a) True
b) False
