CDC endorses PFE’s Prevnar 13 for adults age 19-49, but not (yet) for age 50+, which is a consequential market segment for this product: http://in.reuters.com/article/2012/06/20/us-pfizer-cdc-idINBRE85J12M20120620 See #msg-72423498 and #msg-62921065 for background.