Badgers are ultimately responsible for roughly half of tuberculosis (TB) in cattle in areas with high TB prevalence, according to new estimates. However, only approximately six per cent of infected cattle catch TB from badgers, with onward transmission between cattle herds accounting for the remainder of TB infections, the study suggests. The findings were published online on October 10, 2013 in the open-access journal PLOS Currents: Outbreaks. The role of badgers in spreading bovine TB has been debated intensely as part of discussions about whether badgers should be culled to control the disease. The Randomized Badger Culling Trial, which ran from 1998 to 2005, found evidence that culling could reduce TB in herds inside culled areas, while increasing TB in areas nearby. Mathematical models based on data from the trial were previously used to calculate an estimate of the proportion of TB in cattle that could ultimately be attributed to transmission from badgers. The new paper, by scientists at Imperial College London, provides a more detailed analysis. It estimates that badgers ultimately account for 52 per cent of cattle TB in areas where prevalence in cattle is high. There is considerable uncertainty around this estimate, but the authors say that 38 per cent is a robust minimum value for the estimate. There is no robust maximum value. Professor Christl Donnelly, from the Medical Research Council Centre for Outbreak Analysis and Modelling at Imperial College London, said: “These findings confirm that badgers do play a large role in the spread of bovine TB.
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