The California Department of Public Health says the CDC confirmed the case earlier today.
It comes after the agency identified a person who had contact with infected dairy cattle over the weekend.
The department also announced two new possible cases have been detected.
It did not specify in which county the infections occurred and there is no known link between the cases.
This third confirmed case comes after the Tulare County Department of Health confirmed two human cases of bird flu last week.
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The people were also in contact with infected cattle.
All three had contact with animals at three different farms.