Just when you think things might start to improve.
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A new strain of flu that has the potential to become pandemic has been identified in China by scientists.
It emerged recently and is carried by pigs, but can infect humans, they say.
The researchers are concerned that it could mutate further so that it can spread easily from person to person, and trigger a global outbreak.
They say it has "all the hallmarks" of being highly adapted to infect humans - and needs close monitoring.
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The virus, which the researchers call G4 EA H1N1, can grow and multiply in the cells that line the human airways.
They found evidence of recent infection starting in people who worked in abattoirs and the swine industry in China.
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The immune systems of Pigs and Humans are similar. That is why viruses can quickly make the jump from pigs to humans.