Worst US bird flu outbreak since 2015

More than 200,000 birds have been euthanised through several southern US states in the worst bird flu outbreak since 2015.

The worst bird flu outbreak in the US since 2015 could still worsen, an expert says, with more than 200,000 animals already euthanised.

Agriculture officials are trying to limit the damage, but it's unclear whether quarantines, transportation bans and mass killings will stop the spread, said Joseph Hess, a poultry science professor at Auburn University.

The disease was first confirmed in southern Tennessee earlier this month and has since been detected in northern Alabama and western Kentucky.