9:09 AM
Jalal HB
La Nina events may make flu pandemics more likely, research suggests.
US-based scientists found that the last four pandemics all occurred after La Nina events, which bring cool waters to the surface of the eastern Pacific.
In Proceedings of the National Academy of Sciences (PNAS), they say that flu-carrying birds may change migratory patterns during La Nina conditions.
However, many other La Nina events have not seen novel flu strains spread around the world, they caution.
Read more: BBC News Science and Environment
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