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These can be considerably more lethal than chemical agents. Because they are obtained from nature, they are far more accessible to the terrorist and relatively easy to produce. They are primarily an inhalation threat and are usually dispersed in their aerosolized form in the 1 to 5 micron size. They have effects that usually go undetected for days, until large numbers of the population begin to present with similar patterns of symptoms. They vary from incapacitating to lethal and fall into three categories: