Enteric Bacteria (2) Flashcards Preview

MSII: Microbiology Unit 6 > Enteric Bacteria (2) > Flashcards

Flashcards in Enteric Bacteria (2) Deck (22):
1

salmonella
gram stain & shape
motile?
lactose fermenter?
oxidase +/-
urease +/-
H2S +/-

gram negative rod
motile
seldom lactose fermenter
oxidase -
urease -
H2S +

2

what are the 2 types of salmonella that are usually the cause of enteric fever

salmonella typhi and salmonella paratyphi

3

how does salmonella typhi/paratyphi spread to major organs

via lymphatics in a trojen horse

4

tell me about the presentation of the enterocolitis in salmonella

non bloody diarrhea, fever, dehydration

5

tell me about the presentation of the enteric fever in salmonella

high fever, headache, tender abdomen, anorexia, lethargy sometimes rose spots

6

Y. enterocolitica and Y. pseudotuberculosis:
gram stain and shape
lactose fermenter?
urease +/-
motile?

gram - oval rods
non lactose fermenting
urease positive
motile at 25C and nonmotile at 37C

7

what disease does Y. enterocolitica cause

entercolitis

8

how does Y. enterocolitica carry its virulence factors

on chromosome and plasmid

9

what pathogen can cause a "false apendicitis"

Y. enterocoliticia

10

high or low infectious dose with Y. enterocolitica enterocolitis

high infectious dose

11

can Y. enterocolitica cause reactive arthritis

yes

12

what disease can Y. pseudotuberculosis in children

Izumi fever

13

what is the presentation of entercolitis with Y. enterocolitica or Y. pseudotuberculous

diarrhea, dehydration, false appendicitis

14

listeria monocytogenes:
gram stain and shape
motile?
hemolysis?

gram + rod
tumbling motility
beta hemolytic

15

what are 4 ways that humans contract listeria?

unpasteurized dairy
undercooked meat
raw veggies
contact with livestock and manure

16

what organism has the internalin virulence factor and what does it do?

listeria. binds host E-cadherin, mediates invasion of cells in GI tract, placenta, meningitis

17

what organism has the listeriolysin virulence factor and what does it do?

listeria. opens phagosome and bacteria escapes into cytosol

18

what organism has the ActA virulence factor and what does it do?

listeria. allows for cell cell spread by polymerizing the host actin into rockets

19

what can a listeria infection during prego cause

abortion, premature delivery, post partum sepsis

20

what does listeria cause in a newborn

meningitis

21

what does listeria cause in a previous healthy person

gastroenteritis: watery diarrhea, fever, HA, myalgias, abdominal cramps, little vomiting

22

how does listeria appear on culture

small gray beta hemolytic colonies confirmed by motility, sugar fermentation