Gram Stains of Medically Significant Bacteria Flashcards

1
Q

Staphylococcus aureus

A

Gram-positive cocci in clusters

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2
Q

Staphylococcus epidermidis

A

Gram-positive cocci in clusters

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3
Q

Staphylococcus saprophyticus

A

Gram-positive cocci in clusters

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4
Q

Streptococcus pyogenes,

A

Gram-positive coccus in chains

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5
Q

Group B Streptococcus

A

Gram-positive coccus in chains

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6
Q

Streptococcus pneumoniae

A

Gram-positive coccus in pairs

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7
Q

Enterococcus faecalis

A

Gram-positive cocci in chains

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8
Q

Vibrio cholerae

A

Gram-negative bacillus, curved

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9
Q

Vibrio parahemolyticus

A

Gram-negative bacillus, curved

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10
Q

Vibrio vulnificus

A

Gram-negative bacillus, curved

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11
Q

Campylobacter jejuni

A

Gram-negative bacillus, thin curved rods, occasional “s” or gull wing shapes

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12
Q

Helicobacter pylori

A

Curved gram-negative bacillus

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13
Q

Salmonella

A

Gram-negative bacillus

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14
Q

Enteric Fever (Typhoid fever) — Salmonella Typhi & Paratyphi

A

Gram-negative bacillus

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15
Q

Shigella

A

Gram-negative bacillus; member of the family Enterobacteriaceae

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16
Q

Escherichia coli

A

Gram-negative bacillus

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17
Q

Enterotoxic E. coli

A

Gram-negative bacillus

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18
Q

Shiga Toxin-producing E.coli (

A

Gram-negative bacillus

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19
Q

Enterohemorrhagic E. coli

A

Gram-negative bacillus

20
Q

Yersinia enterocolitica

A

Gram-negative bacillus (Family Enterobacteriaceae)

21
Q

Yersinia pestis

A

Gram-negative bacillus

22
Q

Legionella pneumophila

A

Gram-negative bacillus, pleomorphic, stains poorly; culture challenges

23
Q

Pseudomonas aeruginosa

A

Gram-negative bacilli

24
Q

Acinetobacter baumannii

A

Gram-negative bacillus, grows on MacConkey

25
Q

Brucella melitensis & B. abortus

A

Small Gram-negative coccobacillus, very slow growing

26
Q

Francisella tularensis

A

Very small Gram-negative bacillus; grows poorly in standard culture media

27
Q

Bordetella pertussis

A

Gram-negative bacillus (cocco-bacillus) (GNB, GNCB )

28
Q

Haemophilus influenzae

A

Gram-negative coccobacillus (very small, short rod)

29
Q

Haemophilus ducreyi

A

Gram-negative coccobacillus

30
Q

Moraxella catarrhalis (formerly Branhamella catarrhalis)

A

Gram-negative cocci in pairs

31
Q

Neisseria meningitidis

A

Gram-negative cocci in pairs

32
Q

Neisseria gonorrhoeae

A

Gram-negative cocci in pairs

33
Q

Chlamydia trachomatis

A

Very small, unusual, atypical gram-negative bacteria (not realistic to observe via Gram
stain)

34
Q

Chlamydia pneumoniae

A

Very small, unusual, atypical gram-negative bacteria (not realistic to observe via Gram
stain)

35
Q

Mycoplasma pneumoniae

A

Atypical bacterium – no cell wall, small, poorly staining

36
Q

Rickettsia and Orientia species

A

“Atypical” bacteria – small, coccobacilli

37
Q

Coxiella burnetti

A

“Atypical” bacteria – small, coccobacilli, gram-negative but does not stain well

38
Q

Listeria monocytogenes

A

Gram-positive bacillus, aerobic, non-sporeforming (NSF)

39
Q

Corynebacterium diphtheriae

A

Gram-positive bacillus, aerobic, non-sporeforming (NSF), pleomorphic

40
Q

Bacillus cereus

A

Gram-positive bacillus, spore-forming, aerobic

41
Q

Bacillus anthracis

A

Gram-positive bacillus, spore-forming, aerobic

42
Q

Clostridium species

A

Gram-positive bacilli, spore forming; Anaerobe

43
Q

Clostridium difficile

A

Gram-positive bacilli, spore forming; Anaerobe

44
Q

Clostridium botulinum

A

Gram-positive bacilli, spore forming; Anaerobe

45
Q

Clostridium tetani

A

Gram-positive

bacilli, sporeforming, spore causes enlarged end of bacilli, i.e. drumstick shape

46
Q

Bacteroides fragilis

A

Gram-negative bacilli, often pleomorphic