A parent of a newborn asks the nurse why young children seem to become ill so often when compared with older children and adults. Which is the best response by the nurse?
1. "Newborns have lower numbers of natural killer cells."
2. "Newborns have high levels of IgA in their systems."
3. "Newborns are lacking lymphoid tissue."
4. "Newborns have an immature thymus gland."
1
Explanation:
1. Newborns have lower numbers of natural killer cells than do older children and adults, decreasing their ability to respond to certain antigens.
2. IgA is not present at birth. Development of IgA begins at 2 weeks of age but does not reach adult levels until the age of 6.
3. Lymphoid tissue, such as the spleen and tonsils, is present at birth.
4. The thymus is large at birth and grows during childhood, decreasing by adulthood.
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