Lutz CS, et al. - Researchers delineated clinicians’ and pharmacists’ self-reported implementation of the Standards for Adult Immunization Practice (“the Standards”; i.e., routine assessment, recommendation, and administration/referral for needed vaccines, and documentation of administered vaccines, including in immunization information systems). Findings suggested substantial variation in implementation of the Standards by vaccine and provider type. Provider type influenced vaccine needs assessments, recommendations, and stocking/referrals for pneumococcal; tetanus, diphtheria, acellular pertussis; tetanus diphtheria; human papillomavirus; and hepatitis B vaccines. Across the spectrum of provider specialties, there existed gaps in access to recommended vaccines for adults. They suggest greater implementation of the Standards by all providers to improve adult vaccination rates in the US.