When is acute bronchitis contagious and when is it not? seems physicians some say it is and some say it isn't?

Hard to tell: Some cases are viral & contagious during the early febrile phase but less so as it progresses. Some will represent a mycoplasma germ that is contagious & often affects groups. Most that have a simple bacterial bronchitis do so from normal airway germs that settle in after a virus, these are not contagious.My routine is to consider them contagious until fever free 24h or on med 24h.