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File: 970207_aadcn_003.txtSECTION I MEDICAL DEFENSE AGAINST BIOLOGICAL MATERIAL INTRODUCTION Biological warfare is the use of microorganisms or toxins derived from living organisms to produce death or disease in humans, animals, or plants. In spite of the 1972 Biological Weapons Convention prohibiting the use of biological warfare agents, concern over compliance remains. It is possible that allied forces may be exposed to biological weapons. Characteristics of many live agents and toxins make them potentially effective for offensive military use. These agents can provide a readily available and effective weapon in the hands of terrorists as well as assassins. Delivery systems for biological warfare agents most commonly generate invisible aerosol clouds with particles or droplets of greater than 10 microns (m). They can remain suspended for extensive periods. The major risk is pulmonary retention of inhaled particles. To a much lesser extent, particles may adhere to an individual or his clothing. The effective area covered varies with many factors, including wind speed, humidity, and sunlight. In the absence of direct evidence of an attack, the first clue would be mass casualties fitting a clinical pattern compatible with one of the biological agents. This may occur hours or days after the attack. Toxins may cause direct pulmonary toxicity or be absorbed and cause systemic toxicity. Toxins are frequently as potent or more potent by inhalation than by any other route. A unique clinical picture may sometimes be seen which is not observed by other routes (e.g. pulmonary odoms after staphylococcal enterotoxin B (SEB) exposure). Mucous membranes, including conjunctivae, are also vulnerable to many biological warfare agents. Physical protection is then quite important and use of full-face masks equipped with small-particle filters assumes a high degree of importance. Oral: Other routes for delivery of biological weapons are thought to be less important, but are nonetheless potentially significant. Contamination of food and water supplies, either directly or secondarily after an aerosol biological warfare attack, represents a hazard for infection 1
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