29 Questions
What is the effect of Streptolysin O on membrane?
It has a potent damaging effect
Which of the following enzymes is not mentioned as contributing to virulence?
Lipase
What is the role of CAMP factor in S.agalactiae?
It augments the hemolytic activity of Staphylococcus β-toxin
What is the indication of a high titer of ASO?
Active infection with complications
What is the purpose of the CAMP test?
To confirm the presence of S.agalactiae
In which hosts is indirect diagnosis by serodiagnosis done?
Human and horse
What is the purpose of Lancefield grouping in serological tests?
To detect the C-antigen and determine its specifity
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
What is the quickest method to detect the presence of C-antigen mentioned in the text?
Latex agglutination test
What is the specific use of PCR in the detection of Streptococcus?
To detect the presence of Streptococcus equi in nasal swabs
In which organisms are agglutination tests used to detect and titrate ASO?
Human and horse
What is a characteristic of pathogenic streptococci?
They produce mucoid colonies.
What is the primary difference between Streptococcus and Enterococcus?
Streptococcus is smaller in size, while Enterococcus is larger.
What is the purpose of adding blood, serum, or glucose to culture media for Streptococcus?
To provide nutrients for Streptococcus growth.
What is the main difference between Streptococcus and Staphylococcus?
Streptococcus is catalase and oxidase negative, while Staphylococcus is positive.
What is the genus of anaerobic streptococci?
Peptostreptococcus
What is the typical arrangement of Streptococcus cocci?
Pairs or chains
What percentage of NaCl can Enterococci tolerate?
6.5%
What type of haemolysis is characterized by clear zones around colonies?
Beta
Which of the following groups of Streptococci are β-hemolytic?
Groups A, B, C, and G
Which Streptococci group is non-haemolytic?
Gamma
What is the basis of Lancefield grouping classification?
Cell wall carbohydrate antigens
What is the consequence of infection with S.pyogenes in humans?
Scarlet fever, septic sore throat, and rheumatic fever
Which of the following species is associated with chronic mastitis and neonatal septicaemia in cattle?
S.zooepidemicus
Which of the following Streptococci is NOT classified by Lancefield grouping?
S. pneumoniae
What is the characteristic of Pyogenic Streptococci?
They are associated with abscess formation and suppurative conditions
What is the number of serogroups in Lancefield grouping classification?
20
What is the habitat of S.pneumoniae?
Man, primates, and pigs
Which of the following groups is NOT β-hemolytic?
Group D
Learn about the general characteristics of Streptococcus, including its classification, morphology, and pathogenic features. Test your knowledge of this important genus of bacteria!
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
