Gov. Kate Brown's order mandating vaccines for all health care workers could "put additional pressure on an already dangerous nurse staffing crisis in Oregon," the Oregon Nurses Association said Thursday. The ONA represents 15,000 nurses and health care workers as a union statewide. "ONA remains in support of the previous rule from Governor Brown that required COVID-19 testing with a waiver for health care workers who can show proof of vaccination," the Association said in the wake of the governor's announcement.