Gram Neg Diplococci Exam 1 Flashcards
List the organisms in this category.
Neisseria meningitidis, Neisseria gonorrhoeae, and Moraxella catarrhalis
All the organisms in this section are oxidase ___
Positive
Which organism is not normal flora?
Neisseria gonorrhoeae (STD)
What incubation do these organisms prefer?
Increased CO2 levels
Prefer humid conditions (achieved using a candle jar)
True/false? Neisseria gonorrhoeae grows well on SBAP
False. Grows on chocolate.
Which organisms can grow on SBAP and chocolate?
N. meningitidis and M. catarrhalis
What media is selective for N. meningitidis and N. gonorrhoeae?
Modified Thayer-Martin Media
What should you do if you suspect N. gonorrhoeae?
Should be plated immediately to media and placed in CO2 environment.
What can be used on direct gram stain?
Male urethral discharge suspected of gonorrhea. Females are not diagnostic- normal flora resemble Neisseria spp.
When is it ok to presumptively ID N. gonorrhoeae?
Sexually active adults.
Oxidase +, gram - diplococci that grow on selective media for N. gonorrhoeae.
What specimen is Moraxella catarrhalis recognized as significant if found in?
Sputum
What organism’s colonies can be slid across the plate like a hockey puck?
Moraxella catarrhalis
What is Moraxella catarrhalis definitive ID?
Gram Stain, oxidase +, and positive tributyrin hydrolysis test (N. is neg). Another test is DNase Test Agar used to differentiate Moraxella (turns media colorless) and Neisseria spp.
What is the treatment for N. gonorrhoeae?
NO longer penicillin
Rocephin in combination with either azithromycin or doxycycline.
What is the treatment for N. meningitidis?
Intravenous penicillin may still be used
Broad spectrum antibiotic along with corticosteroids
(can lead to Ab resistance and asthma to infants).
True/false? N. gonorrhoeae is the 2nd most common STD behind chlamydia.
True.
What is it called when neonates are delivered vaginally by infected mothers with gonorrhea; can cause blindness?
Gonococcal ophthalmia
How is meningitis spread?
Via respiratory or throat secretions via kissing
Not spread as easily as easily as the cold or flu
Not spread by breathing the air near infected person
What is the 2nd leading cause of community acquired meningitis in the US?
Meningococcal meningitis
What is it called when N. meningitidis is in the blood (bacteremia)?
Waterhouse-Friderichsen Syndrome
What serotypes of N. meningitidis is most encountered in the US?
Groups A, B, C, Y, and W135
