Neisseria
Two major pathogenic species of Neisseria
What type of testing is used to differentiate N. meningitidis, N. gonorrhoeae and Moraxella?
Carbohydrate utilization testing
What type of infections is Moraxella catarrhalis associated with
Respiratory infections
True or False:
Neisseria are considered fastidious organisms.
True
The area with the highest rate of meningitidis infections.
"Meningitis belt" of sub-Saharan Africa
Which two sugars are utilized by N. meningitidis?
Glucose and Maltose
Colony morphology
smooth, large, round and hockey puck like (glides across surface of agar)
What agar is used for the isolation of pathogenic Neisseria from specimens?
Thayer-Martin Selective Agar
Neisseria meningitidis causes what disease? How is it spread?
Meningococcal disease. (meningitis and septicemia)
Spread via respiratory droplets from an infected person.
Sugar utilization testing yields the following results:
GLU: +
MALT: -
LAC: -
SUCR: -
What is the organism?
N. gonorrhoeae
Which Neisseria does Moraxella share morphological and biochemical characteristics with?
N. gonorrhoeae
What color is a positive result in the carbohydrate utilization test?
Yellow
This species of Neisseria is a slow lactose utilizer and is not normally known to be pathogenic in humans.
Neisseria lactamica
This gram negative diplococci is ONPG positive.
N. lactamica
True or False:
Moraxella catarrhalis will grow on blood plate agar
True
You have colonies growing on Modified Thayer-Martin agar. Which of the following is most likely NOT growing on the plate.
Moraxella catarrhalis
Neisseria gonorrhoeae
Neisseria meningitidis
Moraxella
Neisseria gonorrhoeae can be transmitted to the baby during birth. What is this called?
Vertical Transmission or Perinatal Transmission
Which bacteria is DNAse positive.
Moraxella catarrhalis
Which of the following tests best helps to definitively identify Moraxella catarrhalis.
Indole
TSI
MCAT
Citrate
MCAT (butyrate test)
You pull find many gram negative diplococci in a patients CSF sample. What organism would you have in mind as you continue to work up the sample?
Neisseria meningitidis