The answer is that acute forms of bronchitis are very contagious and could easily be spread to everyone you come in contact with. Bronchitis is not something you probably want to share. Bronchitis is broken down into two different types. The first you got acute bronchitis. This is the kind that makes bronchitis contagious, because it is caused by influenza, the common chest cold, or an infection. Commonly, what makes bronchitis contagious is an infection of some sort that causes wheezing, coughing, and hacking. This is very hard for people to work through. It can be very unnerving to have to suffer with bronchitis, contagious or not. The other kind of bronchitis is chronic bronchitis. This produces similar symptoms and signs as acute bronchitis, but is caused by different things. Smoking, second hand smoke, a virus, or something else. This usually isn't the kind of things that make bronchitis contagious. However, it's no less annoying. One thing that is common for both types of bronchitis is that antibiotics don't do any good. Quite simply, most bronchitis, contagious or not, is not affected by antibiotics.