WHO has 'limited information' on spread of bird flu in USbr br The World Health Organization on Feb. 12, 2025 warns that it has only 'limited information' about the spread of bird flu in the United States, which has all but cut communications with the global health body. 'We are communicating with them, but we haven't heard anything back,' says Maria Van Kerkhove, WHO's epidemic and pandemic preparedness and prevention director.