Micro Block 3 Flashcards
Examples of PT w/ compromising/predisposing factors
Surgery Immunoincompetence Diabetic Alcohol/drug use Pregnancy
What are the two modes of infection acquisition
Community
Hospital
What are the geographic distribution/work environment considerations?
Insect vector
Farm/ranch
Construction work
What are the 3 general factors to consider when determining a pathogen
Type of PT
Mode of infection acquisition
Geographic distribution/work environment
All members of a genus will have the same ____ ____ morphology?
Gram Stain
Stain, morphology and appearance of Staph. Aureus
Gram-pos cocci in clusters
Large, yellow beta hemolytic colony
What two agents make up 90% of invasive tissue infections
Staph. Aureus
Group A streptococcus
Staph Aureus is the etiologic agent of what invasive tissue infections?
Folliculitis
Furuncles
Cellulitis
Impetigo
Define furuncles
deep seated infections in/around hair follicles w/ subcutaneous tissue involvement
Wound/internal tissue infections (abscesses) are especially common after ____ and due to ______
Surgery or trauma
External contamination
Difference between Furuncles, Cellulitis and Impetigo
Furuncle- deep infection
Cellulitis- spreads beneath the skin
Impetigo- superficial skin infection w/ small blisters followed by thin surface crusts
Food poisoning is due to ingestion of what type of microbes?
Pre-formed, heat stable enterotoxin
Types A B C (SEB)
Certain strains of bacteria produce enterotoxin when growing at what temp for what duration?
28*C x 2-4hrs
What foods are commonly inhabited by food poisoning microbes?
Cooked/processed meat (especially ham)
Salads
Cream filled desserts
Food poisoning S/Sx are what and develop in what time span?
N/V
Abdominal cramps
Watery diarrhea 2/in 1-6hrs
Lasts up to 24hrs
Characteristics of Toxic Sock Syndrome Toxins, S/Sx and time for onset
Plasmid mediated, causes massive unregulated stimulation of the immune system
Acute illness w/ fever, rash, hypotension, skin desquamation (1-2 weeks after onset)
When are tests for Toxin Shock Syndrome toxins performed?
Usually not performed in routine microbiology labs
Define Scalded Skin Syndrome and who it affects
Exfoliatin toxins
Causes Toxic Epidermal Necrolysis in children younger than 5yrs
S/Sx of Scalded Skin Syndrome
Localized red rash
Conjunctivitis/URI
Large, flaccid bullae that burst and peel sheets of epidermis off to reveal “scalded” dermis
How are bacteria recovered from Scalded Skin Syndrome patients?
Only from the initial infection
Not recovered from bullae
Define septicemia/bacteremia
Bloodstream infection resulting from deep, poorly draining infections
Typically life threatening w/out rapid ABX intervention
Define bone/joint infection
Osteomyelitis
Septic arthritis
Following device implantation or trauma
Lower respiratory and lung abscess infections occur in _% of pneumonia
2%
Usually follow viral respiratory infections or in PTs w/ altered host defenses
What accounts for 75% of Toxic Shock Syndrome?
What are the causes of TSS in men/non-menstruating women?
Highly absorbent tampons (75%)
Absorption of fluids causes change in microbe growth environment which changes host-microbe dynamics
Focal or surgical wound infections
