ATI RN
Pediatric Immunization NCLEX Questions Questions
Question 1 of 5
The classical and alternative pathways meet at complement component:
Correct Answer: A
Rationale: Both pathways converge at C3, where C3b amplifies complement activation.
Question 2 of 5
A CD3pos cell that secretes perforin and granzyme is a:
Correct Answer: C
Rationale: CD3+ cytotoxic T cells (CD8+) secrete perforin and granzyme to kill target cells.
Question 3 of 5
Which of the following peripheral immune tissues is likely to be different from teen through life to old age?
Correct Answer: C
Rationale: The thymus involutes with age, reducing T cell output.
Question 4 of 5
A 4.5-year-old boy presented with history of recurrent attack of secretary otitis media and purulent nasal discharge, Haemophilus influenza revealed by culture of ear discharge, on physical examination there is no tonsillar tissue and no palpable lymph nodes. Of the following, the MOST appropriate test to confirm the diagnosis is
Correct Answer: D
Rationale: The absence of lymphoid tissue and recurrent infections suggest X-linked agammaglobulinemia. Measuring antibodies to routine immunizations tests B-cell function, confirming the diagnosis.
Question 5 of 5
Which of the following statements is TRUE regarding diurnal variation of the absolute eosinophil count (AEC)?
Correct Answer: D
Rationale: Eosinophil counts are lowest in the early morning due to circadian rhythms influenced by cortisol levels, peaking later in the day.