Day4 Flashcards
Gram Negative bacilli that ferment glucose, non-spore forming, facultative anaerobes. They are oxidase negative, catalase positive, gamma or beta hemolytic.30 genera and 120 species.
Enterobacteriaceae
Produce pink or reddish colonies after 18-24hrs of incubation on MAC
Lactose fermenters
This agar is used to differentiate between lactose and non lactose fermenting gram negative bacilli.
MacConkey agar
Produce colorless translucent colonies are on MAC
Non-lactose fermenters
Produce faint pink or reddish colonies after 48 hours incubation on MAC
Slow lactose fermenters
True or false:
Most gram negative bacilli are found as normal flora in the intestinal tract.
True
Where can gram negative bacilli be found based off of their natural habitat?
- salt water
- soil
- freshwater
- aquatic animals
- on plants
- most are normal human fecal flora
True or false:
Most Fran negative bacilli are opportunistic pathogens outside the intestinal tract
True
True or false:
Gram positive bacilli can be pathogenic and cause bloody diarrhea, sepsis, of cholera
False, negative
True or false:
Most Enterobacteriaceae are found as normal flora in the intestinal tract.
True
True or false:
Enterobacteriaceae are the most frequently encountered bacteria isolated from many clinical specimens.
True
Where can Enterobacteriaceae be found based off of their natural habitat?
- soil
- animals
- fish
- plants
- insects
- most are normal human fecal flora
True or false:
All Enterobacteriaceae are gram negative bacilli.
True
Some Enterobacteriaceae can produce _________ or _________ which gives the organism virulence.
Enterotoxins or Cytotoxins
True or false:
Enterobacteriaceae are opportunistic outside the intestinal tract.
True
There are currently ___ genera and more than ____ species of Enterobacteriaceae; and ___ which are medically important.
30; 120;10
Name the 10 medically important Enterobacteriaceae.
Citrobacter spp Enterobacter spp. Escherichia spp. Klebsiella spp. Morganella spp. Proteus spp. Salmonella spp. Serratia spp. Shigella spp. Yersinia spp.
Describe the microscopic appearance of Enterobacteriaceae.
Straight sided gram negative bacilli
True or false:
Enterobacteriaceae can be alpha hemolytic
False, beta or gamma
What Enterobacteriaceae will exhibit swarming on blood agar?
Proteus
