All officers and employees of the State Department of Health heretofore performing any duty, power, purpose, responsibility, or jurisdiction to which the department has succeeded, who, on July 1, 1978, are serving in the state civil service, other than as temporary employees, and engaged in the performance of a function vested in the department by Section 100150 shall be transferred to the department. The status, positions, and rights of these persons shall not be affected by the transfer and shall be retained by them as officers and employees of the department, pursuant to the State Civil Service Act except as to positions exempted from civil service.