Billy Dee Williams was born William December Williams on April 6, 1937 in New York City. Billy Dee has notched up an impressive array of film and television appearances over the past 50+ years. He is easily best known to international film audiences as the roguish Lando Calrissian in the last two episodes of the original Star Wars-trilogy: Star ... See full bio Â».
Definition of contagious for English Language Learners. : 1  able to be passed from one person or animal to another by touching. : 2  having a sickness that can be passed to someone else by touching. : 3  capable of being easily spread to others : causing other people to feel or act a similar way.
First, scientists involved with common cold research do not know exactly how long a person with a cold is contagious. Based on previous studies, their best guess is that a person becomes contagious about two to three days before developing the usual symptoms of a cold. Second, this contagious period can last until the person no longer shows any symptoms. So in theory, a person is contagious for about two weeks.