SAN FRANCISCO (AP) — More than 18,000 Kaiser nurses and nurse practitioners in Northern and Central California are planning for an upcoming strike.

The Oakland Tribune reports the two-day strike will take place on Jan. 21-22.

The nurses say Kaiser has cut hospital services, restricted admission of patients and has discharged patients who still need hospitalization.

The walkout will affect all 86 Kaiser Permanente hospitals and clinics in Northern and Central California.

The workers, who are part of the California Nurses Association/National Nurses Association, are striking to protest what they call “a growing erosion of patient care standards,” according to a news release.

Nurses held a two-day strike in November. The union and Kaiser are in contract talks. Kaiser has said it’s hopeful about reaching a fair agreement.