Respiratory Bench Flashcards
Classify the types of respiratory specimens that can be cultured as “non-sterile” relating to the normal flora content of the original site
Expectorated or induced sputum Endotracheal aspirates Bronchioalveolar lavage Bronchial washings Bronch brushes
Classify the types of respiratory specimens that can be cultured as “sterile” relating to the normal flora content of the original site
Transtracheal aspirates
Lung aspirates
“steriles”
Pediatric BAL
Normal Flora of the respiratory tract
- Strep viridian’s group
- Corynebacterium
- Neisseria species
- Coag Negative Staph
- Rothia
- Group F streptococci
- Haemophilus spp other than influenzae
- Enterococcus species
- Candida
- Eikenella corrodens
- Capnocytophaga species
- Moraxella species
5 common “potential pathogens” of the lower respiratory tract
- Streptococcus pneumoniae
- Strep pyogenes
- Haemophilus influenae
- Staphylococcus aureus
- Cryptococcus neoformans
- Moraxella catarrhalis
- Neisseria meningitidis
- Gram Negative Rods
OSOM Ultra Strep A Test
- time?
- principle?
- occurs in 7 minutes
- color immunochromatographic assay using dual label technology
- extraction, form complex with anti-group A strep antibody conjugated to color particles; complex will then bind to capture antibody and visible blue test line will appear.
OSOM Ultra Strep A Test
- collect from where?
- problems with it?
sterile swab from tonsils and or back of throat
- Rapid strep screen: rapid, but not sensitive but very specific
“Strep Throat” screen
- procedure
Swab of the tonsillar areas and posterior pharynx; BAP incubated in anaerobic glove box for 48 hours; screen BAP for beta strep group A only; strep latex test is performed on beta strep for identification.
What specimen types can receive a report of “normal flora”? and what specimen types require listing of all organisms isolated?
“normal flora” - non-sterile
All organisms - sterile
When are expectorated or induced sputums, and endotracheal or tracheostomy aspirates considered unsatisfactory for culture workup?
if there are > 10 squamous epithelial cells per low power field
How do you quantitate growth of organisms on respiratory culture media?
dependent on quadrant where organisms are growing (1+/few, first quad; 2+/moderate, second quad, 3+/many, third quad; 4+/many , fourth quad)
Pathogens commonly isolated from Cystic Fibrosis patients
Staphaureus or Haemophilus
Pseodomonas aeruginosa
Burkholderia cepacia
Stenotrophomonas maltophilia
Susceptibilities for Pseudomonas aeruginosa
colistin e-test
Susceptibilities for Stenotrophomonas maltophilia
Moxifloxacin and minocycline e-test
Cystic Fibrosis:
- choice of selective media
- length of incubation
- purpose of selective media
- PC and Mannitol Salt agar (MSA) plates
- on day two incubated in ambient air incubator
- PC agar for Burkholderia cepacia
- MSA agar
Appropriate Media for:
- Throat strep screens
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