Clumps of botulism bacteria rods, Clostridium botulinum, dause botulism in man. Botulsim food poisoing is caused by eating food that contain botulism toxin or poison. A common source is improperly preserved home canned foods with low acidity such as corn, green beans, and beets. In severe cases, botulsim can lead to pralysis or death. Botulism bacteria can be used as a bioweapon in the hands of terrorists. Note: Original magnification on film 160x on a 23mm x 35mm slide or 914X on a 5x7 inch print.