Streptococcus Flashcards
Module 2
Morphology of Streptococcus
In pairs/chains
Habitats of Streptococcus
Saprophytes in milk and Parasites in mucous membranes and intestines
Classification of Streptococcus
Sherman and Lancefield
This sherman classification is known to be a pathogenic species of Streptococcus
Pyogenic
This sherman classification is known to produce alpha/green hemolysis
Viridans
This sherman classification is known to be associated with milk
Lactic
This sherman classification is known to affect the intestine
Enterococcus
Carbohydrate or polysaccharide antigen found in cell wall/between the cell membrane
Teichoic Acid
Virulence Factors of Streptococcus
- Hyaluronic Acid
- Protein M
- Lipoteichoic Acid
- Hemolysins
What capsule interferes with phagocytosis
Hyaluronic Acid
This type of protein is a specific immunity-inhibiting the phagocytosis immunotoxic effect on polymorphs and platelets
Protein M
Hair-like fimbriae structures responsible for attachment
Lipoteichoic Acid
This streptolysin is oxygen sensitive and elicits neutralizing antibodies
Streptolysin O
This streptolysin is not sensitive to oxygen, is a peptide, and non antigenic
Streptolysin S
This enzyme of streptococcus activate plasminogen that leads to digestion of fibrin clots
Streptokinase
True or False,
Both Streptolysin O and Streptolysin S are toxic to neutrophils and macrophage
True
This enzyme of streptococcus promotes the spread of infection in tissues
Hyaluronidase
These toxins are low molecular weight proteins
Erythrogenic Toxin
What group of Erythrogenic Toxin is responsible for rashes in scarlet fever
Group A
These extracellular enzymes assists in production of substrates and reduces viscosity of fluid containing DNA
DNAses (A,B,C,D)
Other name of DNAses (A,B,C,D)
Streptodornase
What extracellular enzyme kills phagocytes that are produced by Group A streptococci
NADases (NAD = Nicotinamide Adenine Dinucleotide)
This extracellular enzyme is a broad substrate produced by Group A streptococci
Proteinase
This species of Streptococci is in long chains in secretions from infected udder. Grows brick red on solid medium containing Starch
S. agalactiae
This species of Streptococcus causes severe and acute mastitis, Grouped in the Lancefield C, and often produce a distinct greenish discoloration
S. dysagalactiae
This species of streptococcus is a normal commensal of the skin and Upper Respiratory Tract
S. zooepidemicus
To what other species of Streptococcus is S. zooepidemicus related to
S. equi and S equisimilis
True or False
S. dysgalactiae produces hyaluronidase
True
This species of Streptococcus is the common cause of suppurative arthritis in pigs causing lameness and necrosis of joints
S. equisimilis
This species of Streptococcus causes acute but mild bovine mastitis and does not react with Lancefield grouping system
S. uberis
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
S. equi
This species of Streptococcus causes cervical lymphadenitis and swine strangles
S. porcinus
What is the Lancefield classification of S. porcinus
Group E streptococci
This species of Streptococcus causes meningitis and septicemia in young pigs
S. suis
Which among the species of Streptococcus is said to be zoonotic
S. suis
This species of Streptococcus affects mucous membranes of dogs and cats
S. canis
This species of Streptococcus is abundant in feces of Horse
S. equinus
Is S. equinus pathogenic or non-pathogenic
Non-pathogenic
This species of Streptococcus is always present in milk and is known as a milk souring organism
S. lactis
This species of Streptococcus is always present in mouth and intestinal tract of cattle
S. bovis
