Final answer:
Toxic shock syndrome toxin produced by Staphylococcus aureus and streptococcal pyrogenic toxins from Streptococcus pyogenes are two superantigens that can lead to serious conditions like toxic shock syndrome and scarlet fever due to excessive immune response.
Step-by-step explanation:
Two examples of superantigens are the toxic shock syndrome toxin (TSST) produced by Staphylococcus aureus and the streptococcal pyrogenic toxins produced by Streptococcus pyogenes. These superantigens cause an excessive immune response by stimulating a large proportion of T cells, leading to a potentially fatal condition known as a cytokine storm.
This can result in symptoms like high fever, low blood pressure, and multi-organ failure. For instance, TSST is closely related to cases of toxic shock syndrome, particularly in menstruating women. On the other hand, streptococcal pyrogenic toxins can lead to diseases like scarlet fever and streptococcal toxic shock syndrome.