KROK 1 2009 – Question 33 · KROK (Medicine) · Microbiology, Virology, and Immunology
In a 2-year-old child with catarrhal presentations and skin rash a pediatrician suspected scarlet fever. The child was given intracutaneously a small dose of serum antibody to the streptococcal erythrogenic toxin; on the site of injection the rash disappeared. What do the reaction results mean?
- A. The clinical diagnosis was confirmed
- B. The disease wasn’t caused by haemolytic streptococcus
- C. The child has very weak immune system
- D. The whole serum dose may be injected intravenously
- E. The child has hypersensitivity to the erythrogenic toxin
Hint
Consider what it tells you when antibodies against one specific toxin make a skin sign vanish at the site where they are injected.
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