A child has chicken pox and recovers. Later, she is exposed to chicken pox and does not get sick, but when she is exposed to influenza she does get sick. This is an example of

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Quizplus · Accepted Answer

This is an example of adaptive immunity, where the immune system has developed a specific response to the chicken pox virus after the initial infection, providing immunity against future exposures to the same virus. However, this specific immunity does not protect against different pathogens, such as the influenza virus.

A Child Has Chicken Pox and Recovers