Lily is a 20-year-old student at the local community college. When some of her friends and classmates told her about an outbreak of flu-like symptoms sweeping her campus during the past 2 weeks, Lily figured she shouldn't take her 3-day sore throat lightly. Your clinic has treated a few cases similar to Lily's. All the patients reported decreased appetite, headaches, and pain with swallowing. As Lily recounts these symptoms to you, you notice that she has a runny nose and a slight hoarseness in her voice but doesn't sound congested. List five different possible conditions for the patient's differential diagnosis and justify why you selected each.