BBC News - Rachel Schraer
Sniffer dogs could contribute to efforts to prevent the spread of Covid as society reopens, according to scientists.
As part of a trial, dogs were trained to recognise a distinctive odour produced by people with the virus, but undetectable to the human nose.
This could come in useful for screening at airports or mass events.
But the dogs' findings would have to be confirmed by lab testing, the researchers said.
Although the dogs correctly picked up 88% of coronavirus cases, they also incorrectly flagged 14% of people who didn't have Covid as having the virus.