Erratum to: A threshold method for immunological correlates of protection

Erratum

After publication of the original article [1], it came to the authors’ attention that there was an error in the Testing for the existence of a threshold sub-section of the Methods.

Two formulae originally published in this sub-section were incorrect; the correct expressions are the negatives of the expressions published. The formulae should have appeared as follows:

$$\mathrm{D}=2\mathrm{l}\left(\mathrm{a},\mathrm{b},\mathrm{\tau }\right)–2\mathrm{l}\left({\mathrm{a}}^{’}\right)$$

and

$$\mathrm{D}’=2\mathrm{l}\left(\mathrm{a},\mathrm{b},\mathrm{\tau }\right)–2\mathrm{l}\left(\mathrm{a}’\right)\mathrm{f}\mathrm{o}\mathrm{r}\mathrm{a}>\mathrm{b}\text{.}$$