Gram-positive and gram-negative.
Exotoxins are a group of soluble proteins that are secreted by the bacterium, enter host cells, and catalyze the covalent modification of a host cell component(s) to alter the host cell physiology. Both Gram-negative and Gram-positive bacteria produce exotoxins. EXOTOXINS. Exotoxins are heat labile proteins that are secreted by some species of bacteria and diffuse readily into the surrounding medium. In contrast to endotoxins, which are integral part of bacteria; exotoxins are actively synthesized and released. Exotoxins are produced by a variety of bacteria including gram-positive and gram-negative bacteria. In some species, most strains produce the same exotoxin while in others only a subset of strains produces a particular exotoxin. They are antigenic and can be toxoided. Their activity can be neutralized by antitoxins. Endotoxins generally act in the vicinity of bacterial growth or presence. Exotoxins are usually secreted by bacteria and act at a site removed from bacterial growth. However, in some cases, exotoxins are only released by lysis of the bacterial cell. 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. 1 This species is motile and produces a single antigenic type of exotoxin. 2  C. botulinum produces oval subterminal spores and is motile. 3  Different strains within this species produce one of 8 exotoxin types (A,B,C1,C2,D,E,F,G). 4  Types C and D are encoded by bacteriophage that infect the bacteria. Description of Exotoxin. Exotoxin: toxic substances produced by certain bacteria, that are found outside the bacterial cell or free in the culture medium; they are heat labile proteins and are among the most poisonous substances known; some fungi also produce exotoxins.
http://www.sciencedirect.com/science/article/pii/B978012373944500225X http://www.microrao.com/micronotes/exotoxin.htm http://textbookofbacteriology.net/proteintoxins.html https://en.wikipedia.org/wiki/Exotoxin http://myplace.frontier.com/~dffix/medmicro/clost.htm http://www.rightdiagnosis.com/medical/exotoxin.htm
what type of bacteria produce exotoxins