Micro-organisms, including bacteria and fungi
An exotoxin is a toxin secreted by bacteria. An exotoxin can cause damage to the host by destroying cells or disrupting normal cellular metabolism. They are highly potent and can cause major damage to the host. Exotoxins may be secreted, or, similar to endotoxins, may be released during lysis of the cell.  Clostridium perfringens food poisoning: C. perfringens is another bacterium that is capable of producing toxin. Consuming food that has a large number of such bacteria can lead to severe abdominal cramping and diarrhea in 8-22 hours after eating. What are foodborne toxins? Foodborne toxins are toxins that are found in different foods that can cause illness when they are consumed. Some are naturally occurring toxins that are found in certain foods, and others are produced by bacteria that have contaminated a food item. Bacteria generate toxins which can be classified as either exotoxins or endotoxins. Exotoxins are generated and actively secreted; endotoxins remain part of the bacteria. Usually, an endotoxin is part of the bacterial outer membrane, and it is not released until the bacterium is killed by the immune system. Microbial toxins promote infection and disease by directly damaging host tissues and by disabling the immune system. Some bacterial toxins, such as Botulinum neurotoxins, are the most potent natural toxins known. However, microbial toxins also have important uses in medical science and research. (Redirected from Bacterial toxin). Microbial toxins are toxins produced by micro-organisms, including bacteria and fungi. Microbial toxins promote infection and disease by directly damaging host tissues and by disabling the immune system. Some bacterial toxins, such as Botulinum neurotoxins, are the most potent natural toxins known. However, microbial toxins also have important uses in medical science and research. Pathogenic Bacteria. Pathogenic bacteria (bacteria capable of causing disease) because they release chemicals called toxins. Toxins are classified as either endotoxins or exotoxins. Endotoxins produce toxic substances which are stored in their cell walls and released when the bacterial cells are lysed (broken open) Toxin-producing Bacteria. Consuming food that has been contaminated can cause food poisoning via bacterial intoxication. The bacteria multiply in the contaminated food product and/ or the body, and the byproduct of this multiplication can be toxic-which is a poison that leads to illness.  Toxins Produced by Bacteria Toxins Produced by Bacteria Staphylococcal food poisoning: The enterotoxins produced by certain strains of Staphylococcus aureus can cause a rapid onset (usually in a few hours) of symptoms which can include nausea, vomiting, and ab-dominal cramping. What are foodborne toxins? Foodborne toxins are toxins that are found in different foods that can cause illness when they are consumed. Some are naturally occurring toxins that are found in certain foods, and others are produced by bacteria that have contaminated a food item. E.coli or Escherichia coli are bacteria that normally live in the intestines of humans and animals. Although, most strains of these bacteria are harmless, several are known to produce toxins that can cause diarrhea. One particular E.coli strain called 0157 can cause severe diarrhea and kidney damage. 
https://en.wikipedia.org/wiki/Exotoxin http://www.phila.gov/health/pdfs/diseases/FoodborneToxins_Bacteria_FAQ_2011.pdf https://en.wikipedia.org/wiki/Bacterial_toxin https://en.wikipedia.org/wiki/Bacterial_toxin http://peer.tamu.edu/curriculum_modules/Properties/module_1/lesson_bacteria3.htm http://www.evercleanservices.com/news-press/current-trends/toxin-producing-bacteria http://www.phila.gov/health/pdfs/diseases/FoodborneToxins_Bacteria_FAQ_2011.pdf http://www.accepta.com/environmental-water-wastewater-knowledge/pathogen-control-knowledge/297-food-poisoning-bacteria-salmonella-listeria-e-coli-0157-campylobacter
toxins bacteria produce