Hepatitis A is a disease that causes an acute inflammation of the liver [1]WHO.Hepatitis A vaccines. fact sheet N??328. <a href="http://www.who.int/mediacentre/factsheets/fs328/en/index.html">http://www.who.int/mediacentre/factsheets/fs328/en/index.html</a> (last accessed on 28/11/2011).