Letters laced with deadly bacteria spores served as a lethal reminder about the threat of bio-terrorism scarcely a month after the shock of 9/11. The anthrax attacks in October of 2001 killed 5 people and infected another 17. The offices of the media and those of the two senators affected had to be cleaned at enormous time and expense. Basically, each building had to be treated twice – once with ClO2 to get rid of the infectious agent and another time with sodium bisulfite to neutralize the chlorine dioxide that kills the anthrax. (more…)