You wake up in the morning and something just does not feel right. You are tired and your throat feels a little scratchy. The next day you have a runny nose, and you seem to have developed a cough in addition to the malaise. After about a week you get better.

a. What is the most likely disease and what infectious agent(s) cause(s) it?
b. What would it be more likely to be if the symptoms were accompanied by a fever above 100°F and other symptoms like sweats and chills?