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Which of the following test indicates the susceptibility to streptococcal pyrogenic exotoxin?

  • A.Schick test
  • B.Dick test
  • C.ASO test
  • D.Precipitation test

Answer: B

Correct answer: Dick test

The Dick test injects a small dose of streptococcal pyrogenic (erythrogenic) exotoxin intradermally: a local erythematous reaction shows that the person lacks neutralising antibody and is therefore susceptible to scarlet fever. The Schick test is its diphtheria counterpart, and the ASO test measures antibody to streptolysin O rather than susceptibility to the toxin.

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