California investigating possible case of bird flu in dairy worker 

chicago — 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 Thursday.  The virus' jump to cattle in 14 states and infections of 13 dairy and poultry farmworkers 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, and the U.S. Centers for Disease Control and Prevention will do further testing to confirm the finding...