Gram Stain for Select Bacterial Organisms & DOC

Question 1

What color are the gram-positive organisms?

Answer 1

Dark Purple

Question 2

What color are the gram-negative organisms?

Answer 2

Pink

Question 3

Gram-positive anaerobes.

Answer 3

Peptostreptococcus
Propionibacterium acnes
Clostridioides (previously Clostridium) spp.

Question 4

Gram-negative anaerobes.

Answer 4

Bacteroides fragilis

Prevotella spp.

Question 5

Gram-positive rods

Answer 5

Listeria monocytogenes

Corynebacterium spp.

Question 6

Gram-positive cocci-clusters

Answer 6

S. aureus (MRSA)

Question 7

Gram-positive cocci-pairs/chains

Answer 7

Strep. pneumoniae - diplococci
Streptococcus spp. (S. pyogenes)
Enterococcus spp. (VRE)

Question 8

Gram-negative cocci

Answer 8

Neisseria spp.

Question 9

Gram-negative rods that do NOT colonize the gut

Answer 9

Pseudomonas
H. influenzae
Providencia spp.

Question 10

Gram-negative rods that colonize the gut

Answer 10

Proteus mirabilis
E. coli
Klebsiella spp.
Serratia spp.
Enterobacter cloacae
Citrobacter spp.

Question 11

Gram-negative curved or spiraled shaped

Answer 11

H. pylori
Campylobacter spp.
Treponema spp.
Borrelia spp.
Leptospira spp.

Question 12

PEK pathogens

Answer 12

Proteus
E. coli
Klebsiella

Question 13

HNPEK pathogens

Answer 13

Haemophilus
Neisseria
Proteus
E. coli
Klebsiella

Question 14

CAPES pathogens

Answer 14

Citrobacter
Acinetobacter
Providencia
Enterobacter
Serratia

Question 15

Atypicals - do NOT stain

Answer 15

Chlamydia spp.
Legionella spp.
Mycoplasma pneumoniae
Mycobacterium tuberculosis