MICRO:- BACILLI (FEMENTERS-ENTEROBACTERALES)

Question 1

What’s the habitat of the enterobacterales?

Answer 1

small intestine

• They’re commensals of the small intestine

Question 2

T/F: enterobacterales are ubiquitous

Answer 2

True

Question 3

T/F: enterobacterales are gram negative, non-spore forming and facultative anaerobes

Answer 3

True

Question 4

a catalase positive species

Answer 4

enterobacterale

Question 5

Enterobacterales are catalase positive yet oxidase…

Answer 5

negative

-they do not produce oxidase

Question 6

T/F: enterobacterale ferments glucose

Answer 6

True

Question 7

The glucose fermenters

Answer 7

enterobacterales

Question 8

The capsulated species which reduce nitrate

Answer 8

enterobacterales

Question 9

Ways enterobacterale can infect humans?

Answer 9

• Exogenous infections- organism transmitted from outside source to the human
• Endogenous infections in humans- infection arises from host’s own normal flora

Question 10

Being glucose fementers means enterobacterales are_________fementers

Answer 10

lactose

Question 11

The pathogenesis or virulence factors of enterobacterale

Answer 11

-capsule
-lipoposaccharide
-(Lipid A, Oligosaccharide core, O-antigen)
- Urease
-Fimbriae
- Toxins
- Genetic exchange

Question 12

How do you confirm that a species is a lactose fermenter by looking at agar?

Answer 12

The fermenter gram negative bacilli(enterobacterales), will produce colonies that change colour of the media or colonies

• There’ll be colour change on MacConkey agar plate