TARGETED CONTROL of Tuberculosis in cattle and badgers could support disease control whilst reducing impact on the badger population.

Bovine TB is an infectious respiratory disease of cattle that is mainly spread through inhaling the bacterium Mycobacterium bovis, which can also infect and cause disease in other mammals, including humans, deer, goats, pigs, cats and dogs.

New research has revealed that TB in cattle and badgers passes between members of the same species at least twice as often than between cow and badger.

Scientists analysing genetic data from the bacteria that causes the disease also found that cattle are approximately ten times more likely to catch TB from badgers than badgers are to catch it from cattle.

Research conducted in Gloucestershire over a 15-year period could improve control strategies, reduce disease transmission and cut associated costs.

Using data from an undisturbed population of badgers in Woodchester Park in Gloucestershire and nearby cattle farms, this study provides the first direct evidence of transmission between badgers and cattle.

Researchers analysed the entire genetic make-up of the bacteria from 230 badgers and 189 cattle, a process known as whole genome sequencing. They combined this with detailed information on where the cattle and badgers lived, when they were infected, and whether they could have had contact with one another.

Scientists were then able to estimate how often the two species spread TB, finding that badgers play an important role in the maintenance of the disease in this area.

The work was led by experts from the University of Edinburgh, with collaborators from institutions including the Animal and Plant Health Agency, the University of Glasgow and University College Dublin.

Professor of Veterinary Epidemiology and Data Science, at the University of Edinburgh, Rowland Kao, said: “Current approaches to controlling bovine tuberculosis only discriminate at a very coarse, regional level between areas where badgers are more likely to be involved in infecting cattle from areas where they are not.

"This work identifies genetic signatures that could guide the interpretation of similar data if collected in other, less-intensively studied areas," he continued. “This would allow for a more targeted control of tuberculosis in cattle and badgers, aiding efforts to control the disease and reduce the impact on the badger population.”