A nurse is providing information to a group of new mothers. Which statement best explains why newborns and young infants are more susceptible to infection?
1. "They have high levels of maternal antibodies to diseases to which the mother has been exposed."
2. "They have passive transplacental immunity from maternal immunoglobulin G."
3. "They have immune systems that are not fully mature at birth."
4. "They have been exposed to microorganisms during the birth process."
Correct Answer: 3
Rationale: Newborns have a limited storage pool of neutrophils and plasma proteins to defend against infection. Newborns' and young infants' high levels of maternal antibodies, passive transplacental immunity, and exposure to microorganisms during the birth process are all true but are incorrect answers because they do not explain the susceptibility of newborns and young infants to infection.
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