The three meningococcal C conjugate vaccines that are currently licensed in the UK were approved primarily on the basis of immunogenicity studies conducted from around 1995 onwards as follows:Meningitec - studies in the US and the UK;Menjugate - studies in the US, Canada, Netherlands and UK;NeisvacC - studies in the US and the UKIn addition, there are ongoing trials with all three vaccines, including some trials that incorporate UK study sites...