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?

"I can visit my nephew who has chickenpox 5 days after the sores have crusted."

"I should take antibiotics when I have a virus."

"I should wash my hands for 10 seconds with hot water after working in the garden."

"I can clean my cat's litter box during my pregnancy."