A nurse is planning a staff in-service about infection control measures to prevent the spread of influenza in school-age children. Which of the following instructions should the nurse include?

"Administer the influenza vaccine every 6 months."

"Administer antibacterial medication within 24 hr of the onset of symptoms."

"Children should be considered infectious for 14 days after the onset of symptoms."

"Wear a face mask when working within 3 feet of a child who is infected."