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Bacteriology Lecture > Streptococcus > Flashcards

Streptococcus Flashcards

Module 2

1
Q
A
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2
Q

Morphology of Streptococcus

A

In pairs/chains

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3
Q

Habitats of Streptococcus

A

Saprophytes in milk and Parasites in mucous membranes and intestines

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4
Q

Classification of Streptococcus

A

Sherman and Lancefield

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5
Q

This sherman classification is known to be a pathogenic species of Streptococcus

A

Pyogenic

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6
Q

This sherman classification is known to produce alpha/green hemolysis

A

Viridans

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7
Q

This sherman classification is known to be associated with milk

A

Lactic

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8
Q

This sherman classification is known to affect the intestine

A

Enterococcus

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9
Q

Carbohydrate or polysaccharide antigen found in cell wall/between the cell membrane

A

Teichoic Acid

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10
Q

Virulence Factors of Streptococcus

A
  1. Hyaluronic Acid
  2. Protein M
  3. Lipoteichoic Acid
  4. Hemolysins
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11
Q

What capsule interferes with phagocytosis

A

Hyaluronic Acid

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12
Q

This type of protein is a specific immunity-inhibiting the phagocytosis immunotoxic effect on polymorphs and platelets

A

Protein M

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13
Q

Hair-like fimbriae structures responsible for attachment

A

Lipoteichoic Acid

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14
Q

This streptolysin is oxygen sensitive and elicits neutralizing antibodies

A

Streptolysin O

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15
Q

This streptolysin is not sensitive to oxygen, is a peptide, and non antigenic

A

Streptolysin S

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16
Q

This enzyme of streptococcus activate plasminogen that leads to digestion of fibrin clots

A

Streptokinase

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17
Q

True or False,

Both Streptolysin O and Streptolysin S are toxic to neutrophils and macrophage

A

True

18
Q

This enzyme of streptococcus promotes the spread of infection in tissues

A

Hyaluronidase

19
Q

These toxins are low molecular weight proteins

A

Erythrogenic Toxin

20
Q

What group of Erythrogenic Toxin is responsible for rashes in scarlet fever

A

Group A

21
Q

These extracellular enzymes assists in production of substrates and reduces viscosity of fluid containing DNA

A

DNAses (A,B,C,D)

22
Q

Other name of DNAses (A,B,C,D)

A

Streptodornase

23
Q

What extracellular enzyme kills phagocytes that are produced by Group A streptococci

A

NADases (NAD = Nicotinamide Adenine Dinucleotide)

24
Q

This extracellular enzyme is a broad substrate produced by Group A streptococci

A

Proteinase

25
Q

This species of Streptococci is in long chains in secretions from infected udder. Grows brick red on solid medium containing Starch

A

S. agalactiae

26
Q

This species of Streptococcus causes severe and acute mastitis, Grouped in the Lancefield C, and often produce a distinct greenish discoloration

A

S. dysagalactiae

27
Q

This species of streptococcus is a normal commensal of the skin and Upper Respiratory Tract

A

S. zooepidemicus

28
Q

To what other species of Streptococcus is S. zooepidemicus related to

A

S. equi and S equisimilis

29
Q

True or False

S. dysgalactiae produces hyaluronidase

A

True

30
Q

This species of Streptococcus is the common cause of suppurative arthritis in pigs causing lameness and necrosis of joints

A

S. equisimilis

30
Q

This species of Streptococcus causes acute but mild bovine mastitis and does not react with Lancefield grouping system

A

S. uberis

31
Q

This species of Streptococcus causes strangles; Long chains in exudates and fluid cultures; Outer surface of organism with peach fuzz-like coating of protein under electron microscope

A

S. equi

32
Q

This species of Streptococcus causes cervical lymphadenitis and swine strangles

A

S. porcinus

33
Q

What is the Lancefield classification of S. porcinus

A

Group E streptococci

34
Q

This species of Streptococcus causes meningitis and septicemia in young pigs

A

S. suis

35
Q

Which among the species of Streptococcus is said to be zoonotic

A

S. suis

36
Q

This species of Streptococcus affects mucous membranes of dogs and cats

A

S. canis

37
Q

This species of Streptococcus is abundant in feces of Horse

A

S. equinus

38
Q

Is S. equinus pathogenic or non-pathogenic

A

Non-pathogenic

39
Q

This species of Streptococcus is always present in milk and is known as a milk souring organism

A

S. lactis

40
Q

This species of Streptococcus is always present in mouth and intestinal tract of cattle

A

S. bovis

Bacteriology Lecture (7 decks)

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