SAN FRANCISCO (AP) — An estimated 31,000 registered nurses and other front-line Kaiser Permanente health care workers went on strike Tuesday to demand better wages and staffing from the California-based health care giant.

Organizers say the five-day strike across 500 medical centers and offices in California, Hawaii and Oregon is the largest in the 50-year history of the United Nurses Associations of California/Union of Health Care Professionals. The strike could grow to include 46,000 people.

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