Influenza
Ferroni E., Jefferson T.
METHODS AND OUTCOMES: We conducted a systematic review and aimed to answer the following clinical question: What are the effects of vaccines to prevent influenza? We searched: Medline, Embase, The Cochrane Library, and other important databases up to March 2011 (Clinical Evidence reviews are updated periodically; please check our website for the most up-to-date version of this review). We included harms alerts from relevant organisations such as the US Food and Drug Administration (FDA) and the UK Medicines and Healthcare products Regulatory Agency (MHRA).