http://www.journalofclinicalvirology.com/article/S1386-6532%2809%2900194-2/abstract    Conclusion  These results imply that HHV-6A, either in latent  form or during acute infection, directly transactivates HERV-K18. This  HERV-K18 induction may be mediated through IFN-α that is produced by the  HHV-6A-infected cells. The functional implications of superantigen   expression are discussed.     Wikipedia on Superantigen:    Superantigens  (SAgs) are a class of antigens  which cause non-specific activation of T-cells  resulting in polyclonal T cell activation  and massive cytokine  release. SAgs can be produced by pathogenic  microbes  (including viruses , mycoplasma , and bacteria ) [1]  as a defense mechanism against the immune system. [2]  Compared to a normal antigen -induced T-cell   response where .0001-.001% of the body’s T-cells are activated, these  SAgs are capable of activating up to 25% of the body’s T-cells. [ citation needed ]  Furthermore, Anti- CD3  and Anti- CD28  Antibodi...