A nurse is caring for a child who has Kawasaki disease. Which of the following systems is primarily affected by this disease?

A. Kawasaki disease is a systemic vasculitis that predominantly affects medium-sized arteries, including the coronary arteries of the heart. The inflammation of the blood vessels can lead to coronary artery aneurysms and other cardiovascular complications if not promptly treated. B. The respiratory system is not primarily affected by Kawasaki disease. While Kawasaki disease is a systemic illness that can cause fever and inflammation, it primarily affects the cardiovascular system, with inflammation of blood vessels, particularly the coronary arteries. C. The integumentary system (skin, hair, nails) is not primarily affected by Kawasaki disease. Although some children with Kawasaki disease may develop a rash, particularly in the acute phase of the illness, skin involvement is not the primary feature of the disease. D. Gastrointestinal symptoms, such as abdominal pain, vomiting, or diarrhea, can occur in Kawasaki disease but they are not the primary focus of the disease. Kawasaki disease primarily affects the cardiovascular system, leading to inflammation of blood vessels and potential complications such as coronary artery aneurysms.