The World Health Organization urged China on Tuesday to step up testing of wild geese and gulls, as well as humans who've come in contact with them near a remote saltwater lake where 5,000 birds have died. Officials say 54 people have died in Asia so far this year after becoming infected by sick birds - although none in China. So far, Chinese authorities have tested only 12 dead birds and two people, with the people coming up negative.
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