The strike begins Monday at Kaiser facilities in Fresno, Sacramento, San Francisco and in San Jose at Kaiser’s San Jose Medical Center on Hospital Parkway. The Kaiser facility at the Santa Clara Medical Office Building on Lawrence Expressway also is one of the strike targets.

The county has launched an investigation into the hospital’s handling of the superspreader event that infected at least 60 people and killed one.

Hospital officials said Kaiser cut ties with anesthesiologist David Reese Rummell on Sept. 30 after reporting him to state authorities.