Streptococcus Characteristics and Classification

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What is the effect of Streptolysin O on membrane?

It has a potent damaging effect (correct)

It has no effect

It has a protective effect

It has a stimulatory effect

Which of the following enzymes is not mentioned as contributing to virulence?

DNase

NADase

Lipase (correct)

Proteases

What is the role of CAMP factor in S.agalactiae?

It augments the hemolytic activity of Staphylococcus β-toxin (correct)

It enhances the hemolytic activity of Streptolysin O

It stimulates the production of ASO

It has a protective effect on laboratory animals

What is the indication of a high titer of ASO?

Active infection with complications Signup and view all the answers

What is the purpose of the CAMP test?

To confirm the presence of S.agalactiae Signup and view all the answers

In which hosts is indirect diagnosis by serodiagnosis done?

Human and horse Signup and view all the answers

What is the purpose of Lancefield grouping in serological tests?

To detect the C-antigen and determine its specifity Signup and view all the answers

What is the result of a positive reaction in the ring precipitation test?

Formation of a white ring of precipitate close to the interface of the two fluids Signup and view all the answers

What is the quickest method to detect the presence of C-antigen mentioned in the text?

Latex agglutination test Signup and view all the answers

What is the specific use of PCR in the detection of Streptococcus?

To detect the presence of Streptococcus equi in nasal swabs Signup and view all the answers

In which organisms are agglutination tests used to detect and titrate ASO?

Human and horse Signup and view all the answers

What is a characteristic of pathogenic streptococci?

They produce mucoid colonies. Signup and view all the answers

What is the primary difference between Streptococcus and Enterococcus?

Streptococcus is smaller in size, while Enterococcus is larger. Signup and view all the answers

What is the purpose of adding blood, serum, or glucose to culture media for Streptococcus?

To provide nutrients for Streptococcus growth. Signup and view all the answers

What is the main difference between Streptococcus and Staphylococcus?

Streptococcus is catalase and oxidase negative, while Staphylococcus is positive. Signup and view all the answers

What is the genus of anaerobic streptococci?

Peptostreptococcus Signup and view all the answers

What is the typical arrangement of Streptococcus cocci?

Pairs or chains Signup and view all the answers

What percentage of NaCl can Enterococci tolerate?

6.5% Signup and view all the answers

What type of haemolysis is characterized by clear zones around colonies?

Beta Signup and view all the answers

Which of the following groups of Streptococci are β-hemolytic?

Groups A, B, C, and G Signup and view all the answers

Which Streptococci group is non-haemolytic?

Gamma Signup and view all the answers

What is the basis of Lancefield grouping classification?

Cell wall carbohydrate antigens Signup and view all the answers

What is the consequence of infection with S.pyogenes in humans?

Scarlet fever, septic sore throat, and rheumatic fever Signup and view all the answers

Which of the following species is associated with chronic mastitis and neonatal septicaemia in cattle?

S.zooepidemicus Signup and view all the answers

Which of the following Streptococci is NOT classified by Lancefield grouping?

S. pneumoniae Signup and view all the answers

What is the characteristic of Pyogenic Streptococci?

They are associated with abscess formation and suppurative conditions Signup and view all the answers

Streptococcus Characteristics and Classification

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