Nature goes out to the country to track the spread of TB (an unpleasant and expensive disease) by looking at how badgers meet cows… or really really don’t:
Since 2013, the UK’s government has sanctioned the killing of hundreds of badgers (Meles meles) in controversial culls to try to dampen the spread of bovine TB. The disease, caused by the bacterium Mycobacterium bovis, cost the country an estimated £100 million ($131 million) in 2014 alone through compensation and control measures.
But the latest government-funded study — which involved fitting GPS collars and radio collars to track the whereabouts of hundreds of cows and scores of badgers — suggests that bovine TB is probably not passed by direct contact between species, but rather indirectly through contaminated pasture, says Rosie Woodroffe, a badger specialist at the Zoological Society of London who led the work. Despite recording thousands of nights of data, the team didn’t observe a single contact between badgers and cows. “This helps to explain why TB is so hard to control,” she says.
Badger faeces and sputum — and cow pats from infected cattle — might be the carriers of M. bovis in farms, Woodroffe says. And in most cases, pasture and slurry from herds in which bovine TB has been detected is not treated as infectious, she adds.
The work backs up an earlier, smaller-scale study in Northern Ireland, which also suggested that badgers don’t often meet cows.