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Spore forming bacteria are tougher than the average microscopic unicellular organism. These species, which include the genera Bacillus, Clostridium and Sporolactobacillus, can surround themselves with durable coats of protein that allow them to survive in hostile environmental conditions. As spores, bacteria can remain dormant for years, protected from stresses such as chemicals, heat, radiation and dehydration. When revived, however, these bacteria can cause a number of diseases, including botulism, anthrax, tetanus and acute food poisoning.