Which organisms can produce microbial toxins?

Microbial toxins are produced by a variety of microorganisms, which are often ubiquitous in their distribution. These organisms include:1

• Bacteria: Many bacteria produce toxins, which are historically classified as exotoxins (often from gram-positive bacteria) or endotoxins (derived from the bacterial cell wall).2
• Cyanobacteria: Also known as blue-green algae, these primitive organisms can produce toxins that affect fish, livestock, and humans.21
• Fungi: Fungi produce a wide range of toxins, including those from microfungi (such as Aspergillus and Fusarium species) and larger mushrooms (such as those in the genus Amanita).3
• Algae: Various classes of algae produce toxins, including dinoflagellates (notorious for causing red tide and shellfish poisoning), diatoms, and other groups like golden-brown algae.341

These toxins serve various ecological roles, such as defense mechanisms or competitive strategies for territorial rights.1