Figure 1.

Relationship between possum abundance, represented by mean (and 95% CI) modified trap catch index (TCI), and mean prevalence of tuberculosis (TB) in possums from five study areas (>5,000 ha) in the North Island of New Zealand in the late 1990s. The modified TCI is likely to be substantially lower than the standard residual trap catch index measure of possum relative abundance, because far longer than normal trap lines were used and multi-kill cyanide baits were additionally placed between traps. Adapted from Nugent (2005).