Immunity to SARS-COV-2 Virus Infections

This monograph was organized in logical stepwise manner simulating the events for the immunity of human virus infection .It starts with defining infection, infection cycle, post-recovery infection entities as co-infection, re-infection, stealth infection and reactivation infection. Immunity and duration of immunity during infection and in post-recovery period as well as herd immunity. Then it expresses human animal immune simulations.Sars-cov-2 severe infection has the potential to trigger immune reaction phenomena such as; immune-thrombi formation ,hypercytokinemia ,un-restrained complement activation, autoimmune B cell pheno-copy as well as invariant mucosal T cell viral sensor. The immune concerns of chronicity were explained .Finally vaccine race and vaccine immune enhancement were discussed.