Enterobacterales

Question 1

Citrobacter freundii

Answer 1

HECK YES organism (AmpC beta lactamase)

Resistant to cephalosporins (1-3 generation) and other beta lactams + beta lactamase inhibitors

Question 2

Citrobacter koseri, amalonaticus groups

Answer 2

resistant to ampicillin and carboxy penicillins

Question 3

Hafnia alvei

Answer 3

HECK YES

Resistant to cephalosporins 1-3, beta lactams + beta lactamase inhibitors

Question 4

Klebsiella aerogenes

Answer 4

HECK YES
Resistant to cephalosporins 1-3, beta lactams + beta lactamase inhibitors

Question 5

Klebsiella pneumoniae, oxytoca, variicola

Answer 5

Intrinsically resistant to ampicillin and Ticacillin

Question 6

Morganella morganii

Answer 6

SPACE-M

Resistant to Ampicillin and amox/clav and 1-3 gen cephalosporins (inducible ampC)

Also resistant to Tigecycline, Tetracycline, and Colistin

Question 7

Proteus mirabilis

Answer 7

Resistant to Tetracyclines, Nitrofurantoin and Colistin

Question 8

Proteus vulgaris

Answer 8

SPACE-M

Ampicillin, Cephalosporins, Tetracycline, Nitro, and Colistin

Question 9

Providencia rettgeri

Answer 9

SPACE-M

Ampicillin and amox/clav, Cephalosporins, Tetracyclines, Nitro, Colostin

Question 10

Providencia stuartii

Answer 10

SPACE-M

Ampicillin and amox/clav, Cephalosporins, Tetracyclines, Nitro, Colostin and aminoglycosides

Question 11

Salmonella and Shigella

Answer 11

No intrinsic resistance but should NOT be tested against

1-2 Cephalosporins, cephamycins, and aminoglycosides

Question 12

Serratioa marcescens

Answer 12

SPACE-M

Ampicillin and beta lactamase inhibitors, Cephalosporins, Nitro and Colistin

Question 13

Yersenia enterocolita

Answer 13

HECK YES

Ampicillin and amox/clav,, 1-3 Gen Cephalosporins