LOS ANGELES – California's health care system is buckling under the strain of the nation's largest coronavirus outbreak and may fracture in weeks if people ignore holiday social distancing, health officials warned as the number of people needing beds and specialized care soared to previously unimagined levels.Top executives from the state’s largest hospital systems —Kaiser Permanente, Dignity Health and Sutter Health, which together cover 15 million Californians — said Tuesday that increasingly exhausted staff, many pressed into service outside their normal duties, are now attending to COVID-19 patients stacked up in hallways and conference rooms.The CEO of the Martin Luther King, Jr.