“…Across all studies, an average of 34% of hesitant participants were found to doubt the effectiveness of the vaccine, 23,24,26,32,34,37,[73][74][75]77,114 as well as 39% of general participants 43,46,82,[84][85][86]96 and 3% of favourable participants. 26,37 Perceived low vaccine effectiveness was particularly prevalent among hesitant participants in studies in Spain (2013, 66%), 112 the Netherlands (2009, 57%), 26 and Italy (2006-2014, 37%).…”