California Code, Health and Safety Code - HSC § 1261.3

(a) Notwithstanding any other provision of law, for a patient aged 50 years or older, a registered nurse or licensed pharmacist may administer in a skilled nursing facility, as defined in subdivision (c) of Section 1250, influenza and pneumococcal immunizations pursuant to standing orders and without patient-specific orders if all of the following criteria are met:

(b) Nothing in this section amends, alters, or restricts the scope of registered nurse practice including, but not limited to, the scope of practice set forth in Article 2 (commencing with Section 2725) of Chapter 6 of Division 2 of the Business and Professions Code, the implementing regulations, and interpretative bulletins or practice advisories issued by the Board of Registered Nursing.