Efficacy of a trivalent influenza vaccine against seasonal strains and against 2009 pandemic H1N1: A randomized, placebo-controlled trial.

Mcbride WJH, Abhayaratna WP, Barr I, Booy R, Carapetis J, Carson S, De Looze F, Ellis-Pegler R, Heron L, Karrasch J, Marshall H, Mcvernon J, Nolan T, Rawlinson W, Reid J, Richmond P, Shakib S, Basser RL, Hartel GF, Lai MH, Rockman S, Greenberg ME.