▁on ▁the ▁ 6 ▁step ▁method ▁developed ▁by ▁Graham ▁A yl iffe , ▁J R ▁B abb ▁and ▁ ▁A H ▁Qu ora ishi . ▁ ▁D ry ing ▁is ▁an ▁essential ▁part ▁of ▁the ▁hand ▁h yg iene ▁process . ▁ ▁In ▁November ▁ 2 0 0 8 , ▁a ▁non - pe er - review ed ▁study ▁was ▁presented ▁to ▁the ▁European ▁T issue ▁Sym pos ium ▁by ▁the ▁University ▁of ▁West min ster , ▁London , ▁comparing ▁the ▁b acter ia ▁levels ▁present ▁after ▁the ▁use ▁of ▁paper ▁to w els , ▁warm ▁air ▁hand ▁dry ers , ▁and ▁modern ▁jet - air ▁hand ▁dry ers . ▁ ▁Of ▁those ▁three ▁methods , ▁only ▁paper ▁to w els ▁reduced ▁the ▁total ▁number ▁of ▁b acter ia ▁on ▁hands , ▁with ▁" through - air ▁d ried " ▁to w els ▁the ▁most ▁effective . ▁ ▁The ▁present ers ▁also ▁carried ▁out ▁tests ▁to ▁establish ▁whether ▁there ▁was ▁the ▁potential ▁for ▁cross - cont am ination ▁of ▁other ▁was h room ▁users ▁and ▁the ▁was h room ▁environment ▁as ▁a ▁result ▁of ▁each ▁type ▁of ▁dry ing ▁method . ▁They ▁found ▁that : ▁▁ ▁the ▁jet ▁air ▁dry er , ▁which ▁blow s ▁air ▁out ▁of ▁the ▁unit ▁at ▁claimed ▁spe eds ▁of ▁ 4 0 0   m ph , ▁was ▁capable ▁of ▁blow ing ▁micro - organ isms ▁from ▁the ▁hands ▁and ▁the ▁unit ▁and ▁potentially ▁cont amin ating ▁other ▁was h room ▁users ▁and ▁the ▁was h room