Whale breath collected by drones is giving clues to the health of wild humpbacks and other whales.

Scientists flew drones equipped with special kit through the exhaled droplets, or “blows”, made when the giants come up to breathe through their blowholes.

They detected a highly infectious virus linked to mass strandings of whales and dolphins worldwide.

The sampling of whale “blow” is a “game-changer” for the health and well-being of whales, said Prof Terry Dawson of King’s College London.

“It allows us to monitor pathogens in live whales without stress or harm, providing critical insights into diseases in rapidly changing Arctic ecosystems,” he said.

The researchers used drones carrying sterile petri dishes to capture droplets from the exhaled breath of humpback, fin and sperm whales, combined with skin biopsies taken from boats.

They confirmed for the first time that a potentially deadly whale virus, known as cetacean morbillivirus, is circulating above the Arctic Circle.

The disease is highly contagious and spreads easily among dolphins, whales, and porpoises causing severe disease and mass deaths.

It can jump between species and travel across oceans, posing a significant threat to marine mammals.

The researchers hope this breakthrough will help spot deadly threats to ocean life early, before they start to spread.

“Going forward, the priority is to continue using these methods for long-term surveillance, so we can understand how multiple emerging stressors will shape whale health in the coming years,” said Helena Costa of Nord University, Norway.

The study, involving King’s College London and The Royal (Dick) School of Veterinary Studies in the UK, and Nord University in Norway is published in BMC Veterinary Research.