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BACTERIOLOGY > B3.1 GRAM NEGATIVE COCCI > Flashcards

B3.1 GRAM NEGATIVE COCCI Flashcards

1
Q

GENERA AND SPECIES TO BE CONSIDERED

A

➢ Moraxella catarrhalis (Branhamella catarrhalis, Neisseria catarrhalis)
➢ Neisseria gonorrhoeae
➢ Neisseria meningitidis

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2
Q

Other Neisseria spp

A

➢ N. animaloris (CDC group EF-40)
➢ N. cinerea
➢ N. lactomica
➢ N. polysaccharea
➢ N. subflava (N. subflava, N. flava, N. periflava)
➢ N. sicca
➢ N. mucosa
➢ N. flavescens

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3
Q

Neisseriaceae family

A

Neisseria,
Kingella,
Eikenella,
Simonsiella and
Alysiella

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4
Q

Moraxellaceae family

A

Moraxella catarrhalis

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5
Q

Moraxellaceae family characteristics

A

OXIDASE-POSITIVE, GRAM-NEGATIVE DIPLOCOCCI

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6
Q

GENERAL CHARACTERISTICS: NEISSERIA

A

aerobic,
nonmotile,
nonhemolytic,
non-sporeforming,
gram(-) diplococcic

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7
Q

What is the Gram stain characteristic of Neisseria?

A

Gram-negative.

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8
Q

What is the shape and arrangement of most Neisseria species?

A

Diplococci with kidney or coffee bean appearance.

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9
Q

What are the rod-shaped exceptions in the Neisseria genus?

A

Neisseria elongata,
Neisseria weaveri, and
Neisseria bacilliformis.

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9
Q

Are Neisseria species motile or nonmotile?

A

Nonmotile

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10
Q

Are Neisseria species hemolytic or non-hemolytic?

A

Non-hemolytic

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11
Q

Are Neisseria species spore-forming?

A

No, they are non-spore-forming.

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12
Q

What enzyme activity is generally positive in Neisseria species?

A

Cytochrome oxidase and catalase

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13
Q

Which Neisseria species are catalase-negative exceptions?

A

Neisseria elongata and Neisseria bacilliformis

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14
Q

What environmental condition supports optimal growth for Neisseria species?

A

A humid atmosphere; they are capnophilic

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15
Q

What do most Neisseria species ferment?

A

Carbohydrates

16
Q

How susceptible are Neisseria species to environmental factors like drying or chilling?

A

Highly susceptible.

17
Q

What components may need to be added to counteract growth inhibitors for Neisseria?

A

Blood, serum, cholesterol, or oleic acid

18
Q

Which two Neisseria species require iron for growth?

A

Neisseria gonorrhoeae and Neisseria meningitidis

19
Q

What is the typical colony color of most Neisseria species?

A

Non-pigmented

20
Q

Which Neisseria species have yellow-pigmented colonies?

A

Neisseria flava, Neisseria flavescens, and Neisseria subflava

21
Q

What is the appearance of Neisseria colonies on culture media

A

Translucent, grayish-white, convex, and glistening

22
Q

Where are Neisseria species naturally found?

A

Mucous membranes of the respiratory and urogenital tracts.

BACTERIOLOGY (25 decks)

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