Veterinary workers in India have begun culling tens of thousands of chickens in an attempt to combat a fresh outbreak of bird flu in West Bengal. The disease surfaced in the region in January. More than one million birds were slaughtered. But about a month ago officials said the situation was under control.Both outbreaks involve the potentially fatal H5N1 virus, although so far there have been no reports of humans being infected in India.
Scientists fear that the virus could eventually mutate into a form easily transmitted between humans, leading to a pandemic that could kill millions worldwide.

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