ATI RN
NCLEX Pediatric Immunization Questions Questions
Question 1 of 5
The viral infection in the above question began in the respiratory tract. Which antibody class would best protect respiratory epithelial cells from viral infection?
Correct Answer: A
Rationale: IgA is the primary antibody protecting mucosal surfaces like the respiratory tract.
Question 2 of 5
A 5-year-old boy presents with his third episode of painful cervical lymphadenitis. Each was treated with incision and drainage and grew Staphylococcus aureus. At the age of 2 years, he required surgical aspiration of a liver abscess. The most important laboratory test is
Correct Answer: B
Rationale: The nitroblue tetrazolium (NBT) test assesses the ability of neutrophils to produce a respiratory burst, which is defective in chronic granulomatous disease (CGD). The history of recurrent Staphylococcus aureus infections and a liver abscess strongly suggests CGD, making the NBT test the most important diagnostic tool.
Question 3 of 5
Of the following, the findings that are MOST suggestive of DiGeorge syndrome are
Correct Answer: D
Rationale: Hypocalcemia (from parathyroid hypoplasia) and congenital heart defects are hallmark features of DiGeorge syndrome due to thymic and parathyroid underdevelopment.
Question 4 of 5
The highest white blood cells count is seen at
Correct Answer: B
Rationale: WBC counts peak at 12 hours of life (up to 20,000-30,000/μL) due to stress of birth, then decline over time.
Question 5 of 5
Leukemoid reactions (WBC count >50,000/μL) are characterized by abundant
Correct Answer: D
Rationale: Leukemoid reactions show a left shift with mature and immature neutrophils (e.g., metamyelocytes), unlike leukemia, which has blasts.