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It depends on the type of virus that you have. In most cases, you’ll be contagious for a few days, and possibly as long as a week give or take. It’s best to assume you could spread the disease while you have active symptoms. Acute bronchitis is spread from person to person by coughing. The viruses that cause the infection are sprayed into the air or onto people's hands when they cough. You can catch acute bronchitis if you breathe in the viruses or touch hands coated with these viruses.