Appearance

Question 1

Buttery looking

Pinhead colonies

Answer 1

Staphylococcus aureus

Question 2

Gray, pinpoint colonies

Answer 2

Staphylococcus epidermidis

Question 3

Oval/lancet-shaped

“dimple-shaped” “dome-shaped”

Answer 3

Streptococcus pneumoniae

Question 4

Gram-variable, pleomorphic

“Satellites” around organism with pyridoxal

Answer 4

Abitrophia, Granulicatella

Question 5

Coffee / kidney-bean shaped

Answer 5

Neisseria gonorrhoeae

Question 6

Rod- shaped

Answer 6

“N. WEB”

Neisseria elongata
Neisseria bacilliformis
Neisseria weaver

Question 7

Bluish gray colonies on BAP

Answer 7

Neisseria meningitidis

Question 8

“Bread-crumbs”

Answer 8

Neisseria sica

Question 9

Resemble Neisseria; grow from end to end with adjacent sides flattened

“Hockey-puck” appearance

Answer 9

Moraxella catarrhalis (Branhamella catarrhalis)

Question 10

“Stacked brick” appearance

Answer 10

Enteroadherent E. Coli (EAEC)

Question 11

Musty, pungent, “rotten potato-like” odor

Answer 11

Serratia odorifera

Question 12

“Burnt chocolate or gunpowder” odor

Answer 12

Proteus

Question 13

Closed safety pin, with bipolar bodies

Broth: Stalactite-shaped pattern

Answer 13

Yersinia pestis

Question 14

With bipolar bodies

“Bull’s eye” appearance in CIN

Answer 14

Yersinia enterolitica

Question 15

Comma, curved bacilli

Answer 15

Vibrio

Question 16

“Bull’s eye” appearance in CIN

Answer 16

Aeromonas

Question 17

S-shaped rods, seagull wing-shaped

Tailing effect, spreading

Answer 17

Campylobacter

Question 18

S-shaped rods, similar to Campylobacter

Answer 18

Helicobacter

Question 19

Metallic sheen in BAP, “grape-like” or “corn tortilla” odor

Answer 19

Pseudomonas aeruginosa

Question 20

Mistaken as Neisseria

Answer 20

Acinetobacter

Question 21

“Ammonia” odor

BAP = lavender-green colonies

MAC = blue colonies

Answer 21

Stenotrophomonas maltophilia

Question 22

Non-wrinkled yellow colonies in BAP

Answer 22

Buckholderia cepacia

Question 23

With bipolar bodies

Answer 23

Buckholderia pseudomallei

Question 24

Comma, curved bacilli

Violet (violacein pigment)

Answer 24

Chromobacterium violaceum

Question 25

Fruity odor (“apples or strawberries”)

Answer 25

Alcaligenes faecalis

Question 26

Mucoid and greenish (including media)

Answer 26

Shewanella putrefaciens

Question 27

“Amorphous serous material”

Answer 27

Haemophilus spp.

Question 28

“Mousy” or “bleach-like” odor

Answer 28

Haemophilus influenzae

Question 29

“School of fish”

Answer 29

Haemophilus ducreyi

Question 30

“Star-shaped” appearance

Answer 30

Aggregibacter actinomycetemcomitans

Question 31

“False Gram positive” reactions in some parts of cells | Exhibit “rosette” formation, pits agar

Answer 31

Cardiobacterium hominis

Question 32

“Sandy” appearance

Answer 32

Brucella

Question 33

“Mercury drops” in Berdet-Gengou agar

Answer 33

Bordetella pertussis

Question 34

Faint bipolar staining

Answer 34

Francisella tularensis

Question 35

“Mushroom smell”

Answer 35

Pasteurella multocida

Question 36

“Rainbow color” colonies in buffered charcoal yeast extract (BCYE) agar

Answer 36

Legionella

Question 37

Box-shaped with “empty spaces” (central spores)

Answer 37

Bacillus spp.

Question 38

“Bamboo fishing rod” appearance BAP = “Medusa head” with swirling projection Inoculating loop = “beaten egg white” appearance Penicillin = “string of pearls” Gelatin medium = “inverted pine tree”

Answer 38

Bacillus anthracis

Question 39

“Frosted glass” appearance; spreading growth

Answer 39

Bacillus cereus

Question 40

“Ground glass” appearance; exhibit pigment atoms in BAP

Answer 40

Bacillus subtilis

Question 41

“Blister-like” appearance in BAP

Answer 41

Bacillus pumilus

Question 42

``` “Club-shaped” swellings Highly pleomorphic, resemble Chinese letters “Poached egg” Biotype mitis = “Fried egg” Biotype gravis = “Daisy head” ```

Answer 42

Corynebacterium diptheriae

Question 43

V-shaped forms and palisades | Pinpoint colonies

Answer 43

Corynebacterium urealyticum

Question 44

Parallel rows or palisades; does not exhibit any other characteristic “pleomorphism” from other spp.

Answer 44

Corynebacterium pseudodiptheriticum

Question 45

Club-shaped, V forms

Answer 45

Corynebacterium jeikeium

Question 46

Resemble Streptococci spp.

Answer 46

Listeria monocytogenes

Question 47

“Pipe cleaner” or “test tube brush” appearance in gelatin stab culture

Answer 47

Erysipelothrix rhusiopathiae

Question 48

BAP = “Medusa head” NA = Rhizoid growth

Answer 48

Kurthia

Question 49

Beaded appearance

Answer 49

Aerobic Actinomycetes

Question 50

Wrinkled, chalk-like, orange-tan pigmentation

Answer 50

Nocardia

Question 51

Very similar to Nocardia spp. | “Molar tooth” appearance 

Answer 51

Actinomadura

Question 52

“Musty basement” odor

Answer 52

Streptomyces

Question 53

“Zigzag pattern”

Answer 53

Rhodococcus equi

Question 54

“Sharp bleach odor” pits agar

Answer 54

Eikenella corodens

Question 55

“Cauliflowerxlike” with coroding

Answer 55

Mycobacterium tuberculosis

Question 56

Distinct crossbanding Culture: exhibit dark red crystals of 10-b-carotene

Answer 56

Mycobacterium kansaii

Question 57

With cross-barring

Answer 57

Mycobacterium marinum

Question 58

No crossbanding

Answer 58

Mycobacterium ulcerans

Question 59

“Cigar-shaped” or “pocket-fence” arrangement

Answer 59

Mycobacterium leprae

Question 60

Subterminal spores “boxcar-shaped” BAP: double zone of hemolysis Litmus-milk: Stormy fermentation

Answer 60

Clostridium perfringes

Question 61

Terminal spores, “drumstick” or “tennis racket” appearance

Answer 61

Clostridium tetani

Question 62

Subterminal spores

Answer 62

Clostridium botulinum

Question 63

Subterminal spores Culture: “ground-glass” appearance in CFFA BAP: horse-stable odor

Answer 63

Clostridium difficile

Question 64

Young colonies: “Spider-like” or “wooly” Old colonies: “Molar tooth”

Answer 64

Anaerobic Actinomycetes

Question 65

“Dog bone” shape. Pits agar

Answer 65

Bacteroides ureolyticus

Question 66

“Seagull wing” shaped; fluorescent chartreuse color

Answer 66

Eubacterium

Question 67

Media turns green upon air exposure, “breadcrumb-like” colonies

Answer 67

Fusobacterium

Question 68

“Mulberries” or morula

Answer 68

Ehrlichia

Question 69

“Fried egg appearance”

Answer 69

Mycoplasma hominis

Question 70

Dark brownish lumps on A7 or A8 agar

Answer 70

Ureaplasma urealyticum

Question 71

“L forms or “yeast-like” shape BAP - “Fried egg” appearance Broth - “fluff balls/ bread crumps”

Answer 71

Streptobacillus moniliformis

Question 72

Safety pin appearance, presence of donovan bodies

Answer 72

Klebsiella (calymmatobacterium) granulomatis

Question 73

Spindle-shaped (slight yellow or orange pigmentation)

Answer 73

Capnocytophaga