▁with ▁health tech ▁startup ▁Th ry ve , ▁launched ▁the ▁app ▁Cor ona - Dat ens pen de ▁( Cor ona ▁Data ▁Don ation ) ▁for ▁volunt ary ▁cons ens ual ▁use ▁by ▁the ▁German ▁public ▁to ▁help ▁monitor ▁the ▁spread ▁of ▁COVID - 1 9 ▁and ▁analy se ▁the ▁effect iveness ▁of ▁measures ▁taken ▁against ▁the ▁pan demic . ▁The ▁app ▁was ▁designed ▁to ▁be ▁used ▁with ▁a ▁range ▁of ▁smart watch es ▁and ▁fit ness ▁track ers ▁to ▁share ▁an onym ised ▁health ▁data ▁for ▁scientific ▁purposes . ▁Project ▁leader ▁D irk ▁Bro ck mann ▁said ▁that ▁he ▁hoped ▁ 1 0 0 , 0 0 0 ▁people ▁would ▁sign ▁up . ▁Later ▁that ▁day , ▁the ▁R K I ▁announced ▁that ▁more ▁than ▁ 5 0 , 0 0 0 ▁users ▁had ▁downloaded ▁the ▁app . ▁ ▁A ▁pre lim inary ▁result , ▁published ▁on ▁ 9 ▁April , ▁from ▁a ▁study ▁by ▁the ▁University ▁of ▁Bonn , ▁based ▁on ▁a ▁sample ▁from ▁ 1 , 0 0 0 ▁residents ▁of ▁Gang elt ▁in ▁He ins berg ▁district , ▁North ▁Rhein - West phal ia ▁( NR W ) ▁showed ▁that ▁two ▁percent ▁of ▁its ▁population ▁were ▁inf ected , ▁while ▁ 1 5 ▁percent ▁of ▁the ▁residents ▁have ▁developed ▁ant ib od ies ▁against ▁the ▁S AR S - Co V - 2 ▁virus , ▁regardless ▁of ▁whether ▁they ▁showed ▁any ▁sympt oms . ▁This ▁constit utes ▁a ▁mort ality ▁rate ▁of ▁ 0 . 3 7 ▁percent ,