Anxiety is not contagious in the sense that a virus is contagious. However if you are regularly around a close friend with anxiety, I do believe it could increase your anxiety levels. Also there are the times when you are with a group of alarmists that are always ramping up the anxiety of everyone in the group. For instance, the person that sees doom in everything may cause you to start feeling anxious over something you were comfortable doing in the past.
It will always depend on the circumstances and how well you deal with your own anxiety.
Take care and know coming here and talking with the members is a great way to decrease your own anxiety.