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. Author manuscript; available in PMC: 2008 Dec 20.
Published in final edited form as: Virology. 2007 Sep 7;369(2):245–262. doi: 10.1016/j.virol.2007.06.044

Table 2.

General definitions and equations of pure liminal and incremental models at the virion level

Liminal model Incremental model
Definition A virion is infectious if it has at least a minimum number of functional trimers. Each functional trimer contributes equally and independently to virion infectivity.
Basic equation if S=1 I=Σnr=(n-L+1)nCrqr(1 − q)n − r (Eq. 1)
where q=p3 		I=p3 (Eq. 2)
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