Bronchitis can cause shortness of breath, coughing, wheezing, fatigue, excess mucus production, and fever. COVID-19 can also cause coughing, fatigue, shortness of breath, and fever.
However, a cough caused by COVID-19 is usually a dry, unproductive cough, while a cough caused by bronchitis will sometimes be productive (produce mucus).
Covid-19 is a virus, and bronchitis is typically caused by viruses; both causes can lead to a cough that lasts several weeks or longer.