Several men with peculiar equipment were spotted prodding some of the old elm trees in the North End over the last month. As it turns out the trees were being vaccinated.  The CBRM hired a New Brunswick company called Forestree Care to inoculate the towering elms against Dutch elm disease – a practice first used in the Netherlands where the tree vaccine was developed. This is the first time the trees in Nova Scotia have been asked to roll up their sleeves.