6. Streptolysin O is

A. antigenic
B. oxygen-labile
C. heat-labile
D. all of these

7. Cell wall protein of Streptococcus pyogenes crossreacts with human

A. synovial fluid
B. cardiac valves
C. myocardium
D. vascular intima

8. Individuals suffering from primary atypical pneumonia have agglutinins to

A. Streptococcus MG
B. S avium
C. S mutans
D. Enterococcus faecalis

9. Which of the following test(s) may establish a retrospective diagnosis of streptococcal infection?

A. Anti-DNase B test
B. ASO test
C. Streptozyme test
D. All of these

10. The bacterial sore throat is caused by

A. Staphylococcus aureus
B. Haemophilus spp
C. Streptococcus pyogenes
D. Mycoplasma pneumoniae