For both phenotypes , provider hands were a common reservoir of origin proximal to the transmission event ( 96 % [ 72/75 ] hand origin for E7 and 89 % [ 50/56 ] hand origin for E5 ) and site of transmission ( 94 % [ 16/17 ] hand transmission location for E7 and 86 % [ 19/22 ] hand transmission location for E5 ) .