A nurse is caring for a client whose throat culture is positive for group A streptococcus 24 hr after a rapid strep test (RST) was negative. Which of the following actions is the nurse's priority?

Ask the client to identify friends and family who have been in close contact.

Reinforce teaching about gargling with warm saline several times daily.

Notify the client to return to the clinic for initiation of antibiotic therapy.

Instruct the client to take antipyretics as directed for elevated temperature.