Flashcards in Staphylococcus aureus Deck (40)
What are the two types of patients?
Patient with compromising or predisposing factors
Patients with compromising or predisposing factors are due to these 5 things?
Surgery or trauma
Immunoincompetence or immunosuppression
Alcoholism or drug use
What are the two modes of infection acquisition? (two ways you acquire infectious disease)
What are the three geographic distribution and/or "work" environments?
(places to acquire infections?)
Insect vectors/ climate
Farm & ranch
Is Staphylococcus aureus gram + or gram -?
Cocci in clusters
What causes about 90% of invasive tissue infections?
Staphylococcus aureus pyogenic
What is folliculitis?
What microbe causes this?
Infection of the hair follicle
What is a furnuncle? What microbe causes this?
Deep seated infections (subcutaneous tissue involved) in and around the hair follicle.
What is cellulitis? What microbe causes this?
Similar to folliculitis/boils in skin or tissues but spreads beneath the skin.
What is impetigo? What microbe causes this?
Superficial skin infection characterized by small "blisters"/pustules followed by a thin crust over the area
Staphylococcus aureus is the etiologic agent of?
Invasive tissue infections
Toxic Shock Syndrome
Scalded Skin Syndrome
Bone and joint infections
Pneumonia/Lower Respiratory & Lung Abscess infections
Staphylococcus aureus can cause this especially after surgery or trauma often due to external contamination?
Wound and internal tissue infections (abscess)
Staphylococcus aureus can cause this due to numerous invasive enzymes and toxins.
Tissue damage. Some invasive infections can be very severe.
Staphylococcus aureus food poisoning is due to ingestion of this?
pre-formed heat-stable enterotoxin. Its an enterotoxin that affects the intestinal tract (types A,B,C, etc SEB).
What are the commonly affected foods of Staphylococcus aureus that causes food poisoning?
Cooked or processed meat (especially ham), salads, and cream filled desserts.
What are the clinical symptoms of food poisoning caused by Staphylococcus aureus
Food poisoning symptoms of Staphylococcus aureus start within how many hours and last to about how many hours?
Starts within 1-6 hours and lasts from a few hours to about 24 hours.
True or False
Staphylococcus aureus growth on food produces no change in flavor or odor.
What are the conditions Staphylococcus aureus (certain strains) will produce enterotoxin?
When growing at 28C or higher for 2 to 4 hours.
Certain strains of Staphylococcus aureus produce Toxic Shock Syndrome Toxins (TSST). The TSST toxin probably causes?
Massive and unregulated stimulation of the immune system.
TSST produces what symptoms?
Acute illness with:
What is TSST infection normally associated with?
Use of highly absorbent tampons (about 75% of cases) or with focal or surgical wound infections in men or non-menstruating women.
In TSST, how does the tampon cause infection?
Absorption of fluids causes change of microbial growth environment resulting in change or host-microbe dynamics.
True or False
TSST test for toxins is usually performed in routine microbiology labs.
What does Scalded Skin Syndrome cause in children under 5?
Toxic Epidermal Necrolysis (TEN)
Strains of scalded skin syndrome produce what kind of toxins? and they are destructive to?
Destructive to epithelial cells
What are the symptoms of Toxic Epidermal Necrolysis in children under 5?
Initially a localized red rash, often following conjunctivitis or upper respiratory tract infection.
Followed by large flaccid bullae.
The bullae of scalded skin syndrome do what?
Rupture and sheets of epidermis peel off to reveal moist, red, "scalded" dermis.