A nurse is discussing risks for infection with the parent of an infant. Which of the following should the nurse include?

This question pertains to pediatric immunology and infection control. Understanding the developmental stages of the immune system, including the roles of passive and active immunity, is essential for educating parents on the physiological reasons why infants are more susceptible to pathogens. Choice A rationale Healthcare settings are high-risk areas for nosocomial infections. Providers can inadvertently act as vectors for pathogens if hand hygiene is not strictly followed, meaning visits to medical facilities naturally increase the infant's exposure to various contagious environmental microorganisms. Choice B rationale Delaying vaccines leaves the child unprotected against preventable diseases during a highly vulnerable period. Vaccines stimulate the production of antibodies, and a delay extends the window of time where the infant lacks specific immunity against dangerous bacterial and viral pathogens. Choice C rationale Effective handwashing for infection prevention should last at least 20 seconds using soap and water. A 10 second wash is insufficient to mechanically remove or chemically neutralize most pathogenic organisms found on the skin, leaving the infant at risk. Choice D rationale Infants have low levels of immunoglobulin A and an inexperienced adaptive immune system. This physiological immaturity means they cannot mount a robust defense against new pathogens, significantly increasing their susceptibility to severe infections compared to older children or adults..