The ecology of brushtail possums [Trichosurus vulpecula] populations infected with bovine tuberculosis [in New Zealand]
1991
Hickling, G.J.
Australian brushtail possums (Trichosurus vulpecula) have spread throughout New Zealand and are regarded as a major pest species, due in part to their role as the principal wildlife vector of bovine tuberculosis (Tb). Three areas recently surveyed had overall low prevalences of Tb possums (1-3%), with diseased individuals aggregated within foci of infection (20-30% prevalence). The disease tends to be more prevalent in males, especially when immature. Bovine tuberculosis is self-sustaining in possum populations in the absence of cattle, so possum control contributes to eradication by killing infected possums and by reducing transmission of disease among the survivors. Possums are particularly effective vectors for Tb because of their susceptibility, infectivity, and contact with cattle. High numbers of possums den in scrub and forest adjacent to improved pasture, and spend much time foraging on pasture vegetation. The persistence of stable Tb foci over many years raises questions about the effect of habitat on disease transmission among possums
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