Chapter 19 Flashcards
The skin is an effective barrier against invading microbes because
the outer layers are dead and covered in salt
Normal skin microbiota are able to grow on the skin because they can thrive in the presence of
sebum and salt
An infection of a hair follicle at the base of an eyelid is called a
sty
The ________ are Gram-positive pleomorphic bacteria commonly found on the skin.
diphtheroids
Virulent strains of Staphylococcus aureus can resist penicillin because they produce
beta-lactamase
Which of the following is a complication that may result from a Streptococcus pyogenes skin infection?
erysipelas
Impetigo can be caused by
both Staphylococcus aureus and Streptococcus pyogenes.
Necrotizing fasciitis is caused by
Streptococcus pyogenes.
A specific wavelength of UVA can be used to treat
acne
Localized swelling of a scratch accompanied by fever, malaise, and swollen lymph nodes may result from infection with
Bartonella henselae
Anthrax derives its name from which of the following aspects of the disease?
the appearance of eschars on the skin
The resistance of Pseudomonas to a wide variety of antimicrobial drugs is due, in part, to its
ability to pump drugs out of the cell
A petechial rash starting on the hands and feet and spreading to the torso is characteristic of
RMSF
Rickettsias require ________, readily available inside cells, for energy production.
amino acids
What is the pathogenic process underlying Rocky Mountain spotted fever?
damage to blood vessels
Infection known as ________ frequently begins as an injury that rapidly becomes red, swollen, hot to the touch, and intensely painful
necrotizing fascitis
Smallpox was the first human disease to be
globally eradicated
Spreading black necrosis, swelling, pain and froth or bubbles are characteristic of
gas gangrene
A herpetic lesion on the finger or hand is known as a
whitlow
Shingles, or herpes zoster, is a reactivation of the virus that causes
chickenpox
Common skin warts are the result of infection with
papillomaviruses
Some strains of Papillomavirus are oncogenic due to their ability to
integrate into the host cell DNA
A reddening of the skin of the face that intensifies when exposed to the sun is characteristic of
erythema infectiosum
Which of the following can cause birth defects?
rubella
A rash characterized by macules which swell, fill with fluid and then pus, then rupture and become crusty lesions, is characteristic of
poxvirus infection
Which of the following is becoming rarer as a result of childhood vaccinations?
subacute sclerosing panencephalitis