Dutch researchers have trained bees, which have an unusually keen sense of smell, to identify samples infected with COVID-19, a finding they said could cut waiting times for test results to just seconds.

To train the bees, scientists in the bio-veterinary research laboratory at Wageningen University gave them sugary water as a reward after showing them samples infected with COVID-19. They would get no reward after being shown a non-infected sample.

Having got used to the system, the bees were able to spontaneously extend their tongues to receive a reward when presented with an infected sample, said Wim van der Poel, a professor of virology who took part in the project.

“We collect normal honeybees from a beekeeper and we put the bees in harnesses,” he said. “Right after presenting a positive sample we also present them with sugar water. And what the bees do is they extend their proboscis to take the sugar water.”