Gaps in our understanding of the natural course of viral pandemics
NACs*:
-Ag-nonspecific killing via natural Abs (NABs) and NK cells provide natural immunity
nonNACs**:
- Contract disease because of weak innate immunity
-Ag-specific killing (neutralization) via ‘adaptive’ Abs protection
-Susceptible to disease when Ab titers wane
New CoV →WEAK INNATE IMMUNITY → ↑ ADAPTIVE IMMUNITY → DISEASE →WANING Ab TITERS →DISEASE
Q: - Why does natural (i.e;, w/o human intervention) viral pandemic comprise 3 waves?
- Why does 2nd wave typically hit younger people?
- Why / how does the virus re-emerge to become seasonal?
Ag: Antigen; Abs: Antibodies
*NACs: Natural asymptomatic carriers ; refers to subjects who do not develop any clinical symptoms at all, or develop at most mild disease (involving upper respiratory airways only), after PRIMARY CoV infection -
- **nonNACs: Relates to subjects who develop severe Covid-19 symptoms after PRIMARY infection
Univac - Strictly Confidential – June 2016 - - 4
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