Final answer:
The nurse should instruct the parent to avoid close contact with other children when their 5-year-old child is diagnosed with impetigo. This is important to prevent the spread of the highly contagious skin infection.
Step-by-step explanation:
The nurse should give the parent the instruction to avoid close contact with other children when their 5-year-old child is diagnosed with impetigo. Impetigo is a highly contagious skin infection, so it is important to prevent the spread of the infection to others. By avoiding close contact with other children, the child's sores will have less chance of coming into contact with others, reducing the risk of spreading the infection.