Classification of Streptococcus Bacteria Quiz

Which Streptococcus species shows growth inhibition by bacitracin?

What is the most important virulence factor in Streptococcus pyogenes?

Which type of haemolysis is seen in Streptococcus pneumoniae?

Which enzyme is used for emergency therapy of myocardial infarction by Streptococcus pyogenes?

Which Streptococcus species is associated with scarlet fever?

What role do Streptococcal pyrogenic exotoxins play in infections by S. pyogenes?

What is the common symptom of pharyngitis caused by S.pyogenes?

Which toxin produced by S.pyogenes is responsible for causing scarlet fever?

How is the diagnosis of pharyngitis due to S.pyogenes confirmed in the laboratory?

What is the mechanism by which streptococcal M serotypes cause acute rheumatic fever?

What type of hypersensitivity reaction is responsible for acute glomerulonephritis caused by nephritogenic streptococcal M serotypes?

Which age group is more commonly affected by acute rheumatic fever compared to acute glomerulonephritis?

Bacitracin Sensitivity

Streptococcus pyogenes shows growth inhibition by bacitracin, distinguishing it from other species.

Virulence Factors

The most important virulence factor in Streptococcus pyogenes is the M protein, which aids in evading the immune response.

Hemolysis Type

Streptococcus pneumoniae exhibits alpha hemolysis on blood agar, characterized by a greenish discoloration surrounding colonies.

Emergency Therapy Enzyme

Streptokinase, produced by Streptococcus pyogenes, is used for emergency therapy in myocardial infarction due to its ability to dissolve blood clots.

Scarlet Fever Association

Streptococcus pyogenes is the species associated with scarlet fever, which is characterized by a distinct rash.

Pyrogenic Exotoxins Role

Streptococcal pyrogenic exotoxins (SPEs) play a crucial role in the pathogenicity of S.pyogenes, contributing to fever and toxic shock syndrome.

Pharyngitis Symptoms

A common symptom of pharyngitis caused by S.pyogenes is sore throat, often accompanied by fever and tonsillar enlargement.

Toxin for Scarlet Fever

The toxin responsible for causing scarlet fever is the erythrogenic toxin, produced by strains of S.pyogenes.

Laboratory Diagnosis

Diagnosis of pharyngitis due to S.pyogenes is confirmed in the laboratory through rapid antigen tests or throat culture.

Acute Rheumatic Fever Mechanism

Streptococcal M serotypes can trigger acute rheumatic fever through molecular mimicry, where antibodies against the bacteria cross-react with heart tissue.

Hypersensitivity Reaction

Acute glomerulonephritis caused by nephritogenic streptococcal M serotypes involves a type III hypersensitivity reaction, where immune complexes deposit in kidney tissues.

Age Group Susceptibility

Children aged 5-15 years are more commonly affected by acute rheumatic fever, whereas acute glomerulonephritis can affect a broader age range but is notable in children as well.

Test your knowledge on the classification of Streptococcus bacteria based on characteristics like haemolysis on blood agar and cell wall carbohydrate antigen groups. Identify important species like S. pyogenes and S. agalactiae.