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Blue-green algae, or cyanobacteria, poisoning is a condition caused by the ingestion of water containing excessive growths of toxin-producing blue-green algae species. Of the more than 2,000 species of blue-green algae identified, at least 80 are known to produce toxins poisonous to animals and humans. Many more species and toxins have yet to be identified. Heavy blue-green algae growth or blooms occur when water sources are contaminated with excessive nutrients, especially nitrogen and phosphorus, and weather conditions are hot and dry. In farm settings, stagnant ponds contaminated with fertilizer run-off or direct manure and urine contamination are prime places for blue-green algae blooms to o
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