▁in ▁which ▁a ▁crown ▁gall ▁( t um or ) ▁is ▁produced ▁as ▁a ▁result . ▁Hel ic ob acter ▁p yl ori ▁uses ▁it ▁for ▁deliver ing ▁C ag A ▁into ▁g astr ic ▁ep ith el ial ▁cells , ▁to ▁indu ce ▁g astr ic ▁cancer . ▁B ord et ella ▁pert uss is , ▁the ▁caus ative ▁b acter ium ▁of ▁who op ing ▁c ough , ▁secre tes ▁its ▁pert uss is ▁to x in ▁partly ▁through ▁T 4 SS . ▁Leg ion ella ▁p neum oph ila ▁that ▁causes ▁leg ion ell osis ▁( Leg ion na ires ' ▁disease ) ▁has ▁a ▁T 4 SS ▁called ▁ic m / dot ▁( int rac ell ular ▁multiplication / def ect ▁in ▁organ elle ▁tra ff ick ing ▁gen es ) ▁that ▁transport ▁many ▁b acter ial ▁prote ins ▁into ▁its ▁e uk ary otic ▁host . ▁More ▁recently , ▁it ▁has ▁been ▁shown ▁that ▁the ▁ph y top ath ogen ▁X anth omon as ▁cit ri ▁util izes ▁its ▁T 4 SS ▁to ▁se crete ▁effect ors ▁that ▁are ▁le th al ▁to ▁other ▁b acter ial ▁species , ▁thus ▁placing ▁this ▁system ▁as ▁a ▁major ▁fit ness ▁determin ant ▁of ▁inter species ▁b acter ial ▁competition . ▁The ▁pro tot yp ic ▁Type ▁IV A ▁secret ion ▁system ▁is ▁the ▁Vir B ▁complex ▁of ▁Ag rob acter ium ▁tum ef aci ens . ▁ ▁Type ▁V ▁▁ ▁Type ▁V ▁secret ion ▁systems ▁( T 5 SS )