A nurse is caring for a child with rheumatic fever. When obtaining the child's medical history from the parent, the nurse should recognize the significance of which of the following data as the possible source of the child's infection?

A. A classmate who has fifth disease: Fifth disease is caused by parvovirus B19 and does not lead to rheumatic fever. Exposure to this virus is unrelated to the pathophysiology of streptococcal infections that trigger rheumatic fever. B. A sibling who had a sore throat 3 weeks ago: Rheumatic fever is a delayed autoimmune response to an untreated or inadequately treated group A beta-hemolytic streptococcal pharyngitis. A history of sore throat 2–4 weeks prior is significant as it indicates a potential antecedent streptococcal infection. C. The father who had gastritis 2 weeks ago: Gastritis is unrelated to group A streptococcal infection and does not serve as a source for rheumatic fever. There is no known pathophysiologic link between gastritis and rheumatic fever. D. A neighbor’s child who has chickenpox: Varicella-zoster virus infection does not trigger rheumatic fever. While chickenpox can have other complications, it is not associated with post-streptococcal autoimmune reactions.