Bronchitis signs can embrace a mild fever, fatigue, shortness of breath, and a cough that brings up yellow or green mucus. Many individuals show symptoms of bronchitis about three to 4 days after having a chilly or the flu. The time period "stomach flu" is actually a misnomer. Lines for flu pictures snaked across the block outdoors of supermarkets and health-division places of work. How Do You Get the Flu Virus?