bronchitis caused by viruses are usually contagious. therefore you should be careful during acute episodes and even a few days after the symptoms subside. general measures of hygiene must be followed to prevent spread of contagious infections.
when am i no longer contagious? i caught a cold then three days later developed bronchitis. i understand the cold has a three-day contagiousness window--one day before you know you are ill and two days following. but what happens when the cold develops into bronchitis? am i contagious again when the bronchitis symptoms appear? bottom line: when am i clear to return to work so i do not infect others?