U.S. poultry producers should ramp up testing and monitoring of turkeys for bird flu before they are slaughtered to ensure the virus stays out of the food supply, the U.S. Department of Agriculture said on Friday.

A child ill with fever and conjunctivitis in San Francisco tested positive for bird flu but had no known source of transmission.

The Centers for Disease Control and Prevention says hospitals treating people for the flu should test them for avian influenza within 24 hours.