| seasonal influenza vaccination and the risk of infection with pandemic influenza: a possible illustration of non-specific temporary immunity following infection. | four canadian studies have suggested that receipt of seasonal influenza vaccine increased the risk of laboratory-confirmed infection with 2009 pandemic influenza a(h1n1). during the influenza season of 2009 in victoria, australia, this virus comprised 97% of all circulating influenza viruses for which sub-typing was available. we found no evidence that seasonal influenza vaccine increased the risk of, or provided protection against, infection with the pandemic virus. ferret experiments have sugg ... | 2010 | 21144441 |