Yet attacks on these sites might release plumes of biological or chemical toxins into the air.

Who are these 'others' who will take these nerve agents and biological toxins to America?

This does not even count other weapons of mass destruction (e.g. biological toxins).

He listed a biological toxin and manmade pollution as among possible causes.

Subsequently, he was arrested on April 16 and charged with possession of a biological toxin and two weapons offenses.

In addition to these living and/or replicating pathogens, biological toxins are also included among the bio-agents.

The search is focusing on a virus, pollution or a biological toxin.

For this reason, biological toxins like botulin toxin rather than bacteria or viruses might seem more attractive as weapons.

This center, built with Soviet Ministry of Defense funds, used to do research on vaccines and biological toxins.

The men breathe air that is filtered to remove any radioactive dust, nerve gases or biological toxins.