At a time when everyone’s being urged to stay healthy with a flu shot, a woman we’ll call Coughin’ Karen is doing everything she can to make you sick. A sixty-something housewife sort in slacks and a sweater, this grey-haired menace struck yesterday at the Bed Bath & Beyond store off Park Lane and North Central Expressway. For 20 minutes she threaded the aisles with a shopping cart, coughing and spitting and hacking so loud that everyone in the big store could hear her–and, here’s the rub, never once covering her mouth. Think of all the folks–from the patrons to the cashiers–that she might have infected, then all the family members they infected in turn. I mean, if they’re serious about this Holy War thing, Osama bin Laden and his boyz could learn a thing or two from Coughin’ Karen.