California is investigating a possible case of bird flu in a dairy worker who had contact with infected cattle, the state's public health department said on Thursday. The virus' jump to cattle in 14 states & infections of 13 dairy and poultry farm workers this year

have concerned scientists and federal officials about the risks to humans from further spread. The worker had a "presumptive positive" result to a test for bird flu, & U.S. CDC will do further testing to confirm the finding, the California Department of Public Health said in a statement.