ATI RN
Pediatric Immunization Practice Questions Questions
Question 1 of 5
A 4-year-old boy presented with high fever, decreased appetite, aphthous stomatitis, and cellulitis of the right calf muscle. His absolute neutrophil count (ANC) was 600/μL. The MOST likely organisms causing this condition are
Correct Answer: D
Rationale: Neutropenia predisposes to bacterial infections; Staphylococcus aureus and gram-negative bacteria (e.g., Pseudomonas) are common culprits in cellulitis and stomatitis.
Question 2 of 5
The immune system uses as well as molecules (e.g. complement components). The immune system uses as well as antigen recognition molecules.
Correct Answer: B
Rationale: The immune system has two main branches: innate and adaptive. Innate immunity uses phagocytes (e.g., macrophages) as cells and complement components as molecules, while adaptive immunity uses lymphocytes (e.g., T and B cells) and antigen recognition molecules (e.g., antibodies, T-cell receptors).
Question 3 of 5
Adaptive immune system response typically takes how long?
Correct Answer: D
Rationale: The adaptive immune response, involving lymphocyte activation and proliferation, takes days to fully develop, unlike the rapid innate response.
Question 4 of 5
Humoral immunity is mediated by antibodies from and is involved in the elimination of pathogens. Cell mediated immunity is mediated by and is involved in the elimination of pathogens.
Correct Answer: B
Rationale: Humoral immunity (B cells) targets extracellular pathogens with antibodies, while cell-mediated immunity (T cells) eliminates intracellular pathogens.
Question 5 of 5
Which of the following produce large amounts of antibodies (Igs) and differentiate upon stimulation from CD4+ cells?
Correct Answer: C
Rationale: Plasma cells, derived from B cells activated by CD4+ T cells, produce large quantities of antibodies.