California health officials reported Tuesday that a child in Alameda County tested positive for H5 bird flu last week.The source of infection is not known — although health officials are looking into possible contact with wild birds — and the child is recovering at home with mild upper respiratory symptoms.

A child in Alameda County is believed to have a case of bird flu, despite no known contact with an infected animal.

A possible human case of bird flu has been reported in Alameda County, according to the California Department of Public Health.