Reading medical study meta-analysis published by The Cochrane Collaboration[0]. There's some fascinating results that run counter to current medical advice.

For example, "Vaccines to prevent influenza in healthy adults" concluded, in part: "Vaccination shows no appreciable effect on working days lost or hospitalisation."[1]

[0] http://www.cochrane.org/evidence [1] http://www.cochrane.org/CD001269/ARI_vaccines-to-prevent-inf...