ACIP recommends Prevar-20 for_adults_who_previously_got Prevnar-13: https://www.pfizer.com/news/announcements/advisory-committee-immunization-practices-recommends-pfizers-prevnar-20r-adults This is a pretty big deal for PFE insofar as it makes Prevnar-20 a source of incremental Prevnar-franchise revenue rather than merely a replacement for Prevar-13 sales. See #msg-164292101, #msg-166441188, #msg-169520866 and #msg-166441188 for related info.