RICHMOND, Va. - Virginia health officials say a woman diagnosed with swine flu has died.

State Health Commissioner Karen Remley said Wednesday that while the cause of death as not been confirmed, the H1N1 virus appears to have been a factor. The woman from the Prince William Health District had an underlying medical condition that put her at greater risk of complications from the flu.

At least three Virginians have died from the virus since early June.

The Centers for Disease Control and Prevention reports 263 deaths caused by the swine flu nationally.