A nurse is teaching a prenatal class about infection prevention at a community center. Which of the following statements by a client indicates an understanding of the teaching?

Choice A reason: Washing hands for 10 seconds with hot water is insufficient; at least 20 seconds with soap and warm water is recommended to remove pathogens post-gardening. Hot water alone is ineffective, so this statement reflects incomplete understanding, making it incorrect. Choice B reason: Visiting a nephew with chickenpox 5 days after sores crust indicates understanding, as the virus is no longer contagious then. This aligns with CDC guidelines for varicella, protecting the pregnant client and fetus, making it the correct statement. Choice C reason: Cleaning a cat’s litter box during pregnancy risks toxoplasmosis, which can harm the fetus. Pregnant women should avoid this task, so this statement shows a lack of understanding, making it incorrect for infection prevention. Choice D reason: Avoiding anyone with a cold sore is overly restrictive, as herpes simplex transmission requires direct contact. General avoidance without context reflects misunderstanding, as precautions like avoiding kissing suffice, making this incorrect.