Î '' Î , staphylÄ `` , `` bunch of grapes '' and Î Ï Î Î Î Ï , kÃ kkos , `` granule '' ) is a genus of Gram-positive bacteria . Staphylococcus ( from the , staphylÄ `` , `` bunch of grapes '' and Î Ï Î Î Î Ï , kÃ kkos , `` granule '' ) is a genus of Gram-positive bacteria .