33 terms

Gram Negative Diplococci

All Neisseria species are positive for this enzyme
In Thayer-Martin, vancomycin inhibits:
Which GNC is capnophilic (requiring CO2 for growth)
Neissieria gonorrhoeae (GC)
Choocolate agar base containing vancomycin, colistin, nystatin, and trimethoprim is also known as:
Modified Thayer-Martin
The tablet containing sodium citrate & sodium bicarbonate that is placed on Jembec plate generates _____ when moisture hits it:
carbon dioxide
All species of the genus Neisseria have the enzyme to oxidize:
A gram-negative diplococcus that grows on modified Thayer-Martin medium can be further confirmed as Neisseria gonorrhoeae if it is:
oxidase +
glucose +
Neisseria meningitidis can be carried in the ______, which serves as a reservoir for infection:
Nasopharynx (N/P)
In Thayer-Martin, nystatin inhibits:
yeast & molds
Organisms that may be mistaken for Neisseria gonorrhoeae in gram-stained smears of uterine cervix exudates include:
Moraxella species (GN diplococci)
In Thayer-Martin, colistin inhibits:
A gram-negative diplococcus isolated from a middle ear aspirate grew on chocolate agar. The organism fails to produce acid from glucose, maltose, lactose, and sucrose. It was DNase positive and is most likely:
Moraxella catarrhalis, an opportunistic pathogen
A penicillin-resistant Neisseria gonorrhoeae produces:
A GNC isolated from the CSF of a 16-yr old ferments glucose and maltose, what is the identity of this organism?
Neisseria meningitidis
An organism previously thought to be nonpathogenic, Moraxella catarrhalis, is now known to be associated with infection and nosocomial transmission. Characteristic identification criteria include:
all carbohydrates negative
A child was diagnosed with bacterial meningitis. Further testing of the spinal fluid would likely indicate:
increased WBCs with a predominance of neutrophils, increased protein, and decreased glucose
Which of the following organisms is Dnase positive:
--N. gonorrhoeae
--N. meningitidis
--Moraxella catarrhalis
--Neisseria sicca
Moraxella catarrhalis
True or False
Neisseria meningitidis cannot grow on blood agar
A gram stain from a purulent drainage of a synovial fluid reveals numerous gram-negative diplococci. The organism grew on chocolate agar and Thayer-Martin but failed to grow on SBA or MAC. Further testing revealed the organism to be Ox + and glucose + and beta-lactamase +. The organism is most likely:
Neisseria gonorrhoeae
N. gonorrhoeae is capnophilic, this means that it:
requires a high concentration of CO2
A gram stain performed on a sputum speciment revealed gram-negative diplococci within PMNs. Oxidase testing is positive and carbohydrate degradation tests are inert. The organism is:
Moraxella catarrhalis
Moraxella is apt to cause what type of infection?
An enzyme that can hydrolyze antibiotics such as penicillin is:
Which statement correctly describes the mode of action of the antibiotic listed for Modified Thayer-Martin agar:
Nystatin inhibits fungi & molds
The member of the genus Neisseria that is always considered to be pathogenic is:
N. gonorrhoeae
The specimen of choice for detecting Neisseria meningitidis carriers would be:
nasopharyngeal (N/P) swab
If Neisseria gonorrhoeae pharyngitis is suspected, throat swabs should be plated on:
Assuming that the agent isolated from a patient's spinal fluid produces a positive oxidase test, the most likely diagnosis is:
meningococcal meningitis
An isolate recovered from a blood culture specimen was subcultured onto chocolate agar and produced gram-negative diplococci that were oxidase positive and produced acid from glucose and maltose but not from lactose and sucrose. The isolate is most likely:
Neisseria meningitidis
Sodium bicarbonate and sodium citrate are components of what media?
JEMBEC system
Waterhouse-Frederichsen syndrome is associated with:
adrenal hemorrhage from Neisseria mengitidis
The following results were obtained from a culture of unknown origin:
OX +
Glucose+ Maltose, Sucrose -
The most likely source of the specimen would be:
genitourinary tract
Which of the following would you LEAST expect to culture from a case of otitis media:
Moraxella catarrhalis
Neisseria meningitidis
Haemophilus influenzae
Strep. pneumoniae
Neisseria meningitidis
Moraxella, S. pneumoniae & Haemophilus influenzae are the three most common causes of otitis media. Neisseria meningitidis may be possible, but is unlikely.