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Badgers ultimately responsible for around half of TB in cattle

Date:
October 11, 2013
Source:
Imperial College London
Summary:
Badgers are ultimately responsible for roughly half of tuberculosis (TB) in cattle in areas with high TB prevalence, according to new estimates based on data from a previous badger culling trial.

Badger (Meles meles)
Credit: Richard Yarnell

Badgers are ultimately responsible for roughly half of tuberculosis (TB) in cattle in areas with high TB prevalence, according to new estimates based on data from a previous badger culling trial.

However, only around six per cent of infected cattle catch TB from badgers, with onward transmission between cattle herds accounting for the remainder, the study suggests.

The findings are published in the 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 Randomised 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, said: "These findings confirm that badgers do play a large role in the spread of bovine TB. These figures should inform the debate, even if they don't point to a single way forward."

The mathematical model suggested that 5.7 per cent* of transmission to cattle herds is from badgers to cattle, with the rest of the contribution from badgers resulting from onward transmission between cattle herds.

*The 95% confidence interval for this estimate is 0.9% to 25%.


Story Source:

The above story is based on materials provided by Imperial College London. Note: Materials may be edited for content and length.


Journal Reference:

  1. Christl A. Donnelly, Pierre Nouvellet. The Contribution of Badgers to Confirmed Tuberculosis in Cattle in High-Incidence Areas in England. PLOS Currents: Outbreaks, October 2012

Cite This Page:

Imperial College London. "Badgers ultimately responsible for around half of TB in cattle." ScienceDaily. ScienceDaily, 11 October 2013. <www.sciencedaily.com/releases/2013/10/131011093824.htm>.
Imperial College London. (2013, October 11). Badgers ultimately responsible for around half of TB in cattle. ScienceDaily. Retrieved April 20, 2014 from www.sciencedaily.com/releases/2013/10/131011093824.htm
Imperial College London. "Badgers ultimately responsible for around half of TB in cattle." ScienceDaily. www.sciencedaily.com/releases/2013/10/131011093824.htm (accessed April 20, 2014).

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