A nurse is creating home instructions for a client who has immunodeficiency. Which of the following statements by the client indicates an understanding of the teaching?

The correct answer is C because avoiding contact with individuals who have received a live vaccine is crucial for a client with immunodeficiency to prevent exposure to potentially harmful pathogens. This is important as live vaccines contain weakened forms of the virus that can still cause infections in immunocompromised individuals. Choice A is incorrect as white patches in the mouth could indicate a fungal infection, which may not be harmless in an immunodeficient individual. Choice B is incorrect as a fever, even mild, could be a sign of infection that may be more severe in an immunodeficient client. Choice D is irrelevant to immunodeficiency and does not impact the client's condition.