Final answer:
Karen cannot rely on antibiotics to treat influenza. Influenza is caused by a virus, and antibiotics are only effective against bacterial infections. Antiviral medications and annual influenza vaccination are the recommended treatments and preventive measures for influenza.
Step-by-step explanation:
Karen cannot rely on antibiotics to treat influenza. Antibiotics are only effective against bacterial infections, and influenza is caused by a virus. Influenza can be treated with antiviral medications, such as oseltamivir (Tamiflu), zanamivir (Relenza), and peramivir (Rapivab), which can help shorten the duration of the illness and alleviate symptoms. However, the most effective way to prevent influenza is through annual vaccination, as recommended by healthcare professionals.