Final answer:
Marcy's symptoms are consistent with having the flu.
Step-by-step explanation:
The reason for Marcy's symptoms of coughing and sweating is that she has the flu. The flu, also known as influenza, is a contagious respiratory illness caused by the influenza virus. Common symptoms of the flu include cough, fever, sweating, fatigue, and body aches. Marcy's symptoms align with those of the flu described in the clinical focus scenarios.