Nurses at a northern California hospital say inadequate masks and air-filters have resulted in medical staffers becoming ill while caring for three swine flu patients.

A complaint filed Tuesday with the state details the allegations against Sutter Solano Medical Center in Vallejo, about 30 miles north of San Francisco.

Nurse Sherry Ramsey says 10 nurses have respiratory illnesses that developed after they treated patients with swine flu.

The complaint, filed with the state's Division of Occupational Safety and Health, also alleges the hospital failed to provide nurses with the fitted, duck bill-shaped masks used for treating patients who have an airborne illness.

A spokesperson for the hospital did not return a phone message Tuesday.