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Flashcards in Gram Neg DSA Deck (16)
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1
Q

Enterobacteriacae characteristics, Virulence factors

A

Gram Neg bacilli, motile except some

Catalase (+), FERMENTS GLUCOSE

Enterobacterial common antigen= core ploysac antigen in nearly all.

Virulence: have some pilli for adhesion and sex
LPS endotoxins.

2
Q

Coliforms are a subgroup of Enterobacteriacae, what is special about them?

Which are they?

A

FERMENT LACTOSE

Pink to purple on MacConkey agar.

Escherichia, Klebsiellia, enterobacter, citrobacter,

3
Q

Escherichia characteristics and virulence

A

Gram (-) bacilli, most are motile
Glucose and Lactose fermenters

virulence: adhesion by common pilli, ST heat stable and LT heat labile
K capsular antigens, K1 antigen- neonatal meningitis

4
Q

Escherichia Colli disease, dx and rx

A

UTI by fecal contamination
Sepsis
Neonatal meningitis
Pathogenic diarrhea

dx: culture in blood media or Mcconkey, shiga toxin assay

Rx: antibiotics

5
Q

Escherichia coli antigens

enterotoxigenic, enteropathogenic, enteroinvasive, enterohemmoragic

A

enterotoxigenic: travlers diarrhea
Enteropathogenic: infantilie diarrhea, salmonella-like
Enteroinvasive ( shigella-like): shigella like diarrhea, bloody
Enterohemmoragic: hemmorhagic colitis, bloody stool

6
Q

Klebsiella

A

Coliform, gram - bacilli
GLUCOSE and LACTOSE fermenters

Dx: blood smears pcr
Rx: antibiotics

7
Q

Which are lactose fermenters?

A

Klebsiella, escherichia, coliform subgroups

8
Q

K. pneumoniae

A

hemorrhagic pneumonia with red currant jelly. most common cause of nosocomial respiratory infections
wound and soft tissue infections

9
Q

K oxytoca

A

colitis, sepsis, wound and soft tissue infection

10
Q

K granulomatis

A

Donovan bodies in mos in smears

Granuloma inguinal with painless genital ulcers

11
Q

ENTERobacter

Common pathogens

Rx:

A

Coliform, ferment lactose, gram neg bacilii

Virulence: B lactamases

Lactose fermenter

pathogens: enterobacter cloacae & e. Gerogens

Rx: antibiotics, CANNOT use B lactamases, even if sensitivity shows it’s sensitive.

12
Q

Citrobacter

Pathogen:

Rx:

A

Cloriform, Lactose fermenter

B lactamase production, LPS endotoxin,

Pathogens: citrobacteria koeseri

Rx: antibiotics

13
Q

Salmonella enterica group characteristics

Dx:
Rx:

A

H2S (rotten egg smell), Vi capsular antigen, Faculative intracellular parasite

Dx: culture in Hektoen enteric agar (demonstrates no lactose fermentation but + h2S fermentation

Rx: antibiotics

14
Q

Salmonella enterica enterica, serovar Enteritidis

serovar Typhi

A

Entertidis: eating contaminated food. activate adenylate cyclase= diarrhea. Produce toxins in mucosa

serovar Typhi: Enteric (typhoid) fever, can mimic apendicitis

15
Q

Shigella

Dysentaria

A

Non cloriform gram -

acid tolerance, invasion proteins

DX: Hectoen (negative lactose and H2S)
Rx:oral rehydration

Dysentaria: enteroinvasive dysentery, cramps and watery bloody diarrhea. Shiga toxins inhibits ribosomes

16
Q

Yersinia

A

bipolar staining coccobacilli, Noncoliform