Flashcards in 7. Upper Respiratory Deck (56):
Media used to detect MRSA
Mannitol salt agar
Eikenella corrodens is associated w/ what infection?
Perimandibular space infections
How to get a true middle ear specimen?
Collect fluid from behind tympanic membrane
(needle through eardrum if still intact; otherwise thin swab if broken eardrum)
When are group A/C/G strep reported?
Group A - always, regardless of amount
Groups C/G - only if it' the predominant organism
Usual organism that causes epiglottis
Haemophilus influenzae type b
Primary etiologic agent of croup?
Also may Mycoplasma pneumoniae
Most widely used media for culturing B. pertussis
AKA Vincent's angina
2 potential complications of strep pharyngitis
- Scarlet fever
- Rheumatic fever
This infection is diagnosed by looking for a fried egg colony formation
Croup (M. pneumoniae)
Why no staph streak for eye infection culture set up?
Collection from eyes already a low organism count - may hide organism
Bug that smells bleach-like
Best detection method for pertussis?
Infection characterized by disintegration of mucosal membranes and bony ridges of nose
Specimen of choice for both culture and PCR of pertussis organisms
- Nasopharyngeal aspirate
- NP swab
Why are epiglottis diagnoses usually made clinically?
Collection of a specimen at the site can INCREASE THE RISK OF OBSTRUCTION
Special media M7 is used for?
Requests for Mycoplasma - croup infections
Best specimen to collect for this infection is a blood culture
Organism that causes whooping cough
Infective agents that usually cause stomatitis
(occasionally bacterial or fungal)
Causative agents of trench mouth
Grm negative fusiform anaerobes
Necrotizing, ulcerative gingivitis
Rapid antigen testing can be performed from this specimen
*culture still performed if negative
Used for pertussis culture confirmation
How does the lab diagnose Vincent's angina?
Examine Gram stained smear of scrapings from the gingiva
Sinus infection that usually affects 10-30 yr olds; how it spreads
Rhinoscleroma - direct inhalation of organism
Arcanobacterium haemolyticum biochemical identification
CAMP reaction inhibited
Infection of the mucous membranes of mouth
Small, gram positive rods that may be curved, slightly gram-variable
Infection due to this organism causes formation of a grey pseudomembrane
Specimen collected to detect N. meningitidis carriage
Serious infection of the aqueous or vitreous humor
Usual infection due to contact lenses and typical organism
Keratitis - P. aeruginosa
Liquid media for eye culture
Blood formulation w/ added Fildes
What is blepharitis and typical causative agents
Eyelash follicle infection
S. aureus, herpes, lice (in children)
Patients are at risk of this infection if they have a peritonsillar abscess due to Fusobacterium necrophorum
Otitis media empiric treatment
SXT if penicillin allergic
Specimen collected for S. aureus carrier detection?
4 uncommon bacteria that cause pharyngitis
Primary cause of otitis externa
P. aeruginosa (swimmer's ear)
Sinus infection that usually affects elderly; how it spreads
Ozena - colonizer; esp in immunocompromised
Nasal passages are commonly colonized with?
5 bacteria that can cause conjunctivitis
- S. aureus
- H. influenzae
- S. pneumoniae
- M. catarrhalis
- N. gonorrhoeae
Infection characterized by slow growing tumour-like nasal obstruction
Most common causative agent of conjunctivitis?
Common cold (adenovirus)
Predominant organisms in peritonsillar abscess
Dental carries are due to which organisms?
Organisms endophthalmitis is associated with
Causes of trench mouth
Poor oral hygiene
2 sinus infections and causative agent
Rhinoscleroma - Klebsiella rhinoscleromatis
Ozena - Klebsiella ozanae
AKA jugular thrombophlebitis
Lemierre's disease (human necrobacillosis)
2 special media used to detect Bordetella pertussis
Antibiotic of choice for treatment whooping cough
- Newer macrolides (clarithromycin, azithromycin)