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Nonspecific: The infected cells produce interferon curtails virus replication in the adjacent respiratory epithelial cells.
Interferon also spreads enters to the circulation for 2-4 day and activates splenic NK cells.
Specific and memory:
Local cytotoxic T cells abort the production of virus and neutralising antibody prevents virus spread so the infection may be stopped by 6 days. The viruses which depend much on Tc to clear them eg RSV and herpesviruses are those for which vaccination has been least successful.
With RSV it is been difficult to induce local cytotoxic T cell immunity w/o DTH-type T cells worsening the lung lesion. This is why no human anti-RSV vaccines are licensed.