Bird flu has reached a new milestone, crossing over to infect and kill a seal in South Australia.
It marks a new phase of the outbreak, and has sparked fears for many endangered wildlife species, which face the possibility of extinction.
So how does the way we farm, eat, and live make us vulnerable to viruses like this? And could humans be at risk with the next mutation?
Today, journalist and author of Sentinel: when diseases spread between animals and humans, Michael Dulaney on the root cause of the virus - and the future of animal pandemics in our times.
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