✅ The verified answer to this question is available below. Our community-reviewed solutions help you understand the material better.
A pediatrician suspects scarlet fever in a 2-year-old child who presents with catarrhal symptoms and a skin rash. The child was given a small dose of serum containing antibodies to the streptococcal erythrogenic toxin. At the injection site, the rash disappeared. What do these reaction results indicate?