As bird flu spread continues, why the recent jump to pigs raises worries
Bird flu has spread far and wide, infecting a range of species like chickens, skunks, cows, foxes and polar bears. But it's the pigs that have experts on high alert.
Bird flu has spread far and wide, infecting a range of species like chickens, skunks, cows, foxes and polar bears. But it's the pigs that have experts on high alert.
