Children under age 6 years are at greater risk for infection due to underdeveloped:
1. Leukocytes.
2. Acquired immunity.
3. Natural immunity.
4. Antigens.
2
Rationale:
1. Leukocytes are present at birth, and phagocytize foreign materials.
2. Acquired immunity, consisting of both humoral and cell-mediated immunity, is not fully developed until a child is 6 years of age. These include the processes responsible for destroying bacterial antigens through the production of antibodies.
3. Natural immunity is the defenses present at birth of intact skin, body pH, and antibodies obtained from the mother.
4. Antigens are the foreign substances that trigger the immune response.
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