Answer :
Answer: exotoxins secreted by bacteria or endotoxins produced body cells after a viral infection.
Explanation:
Superantigens are the exotoxins which are secreted by the particular strain of bacteria. Also these can be consider as an endotoxin that is produce in response of a viral infection. These are produced intracellularly by the bacteria or may be released by the cells in the case of infection as extracellular mature toxins. Thus these are responsible for triggering the immune response in the body of the host.