Simplify the following text for a Grade 9 native English-speaking person.
Original: Staphylococcus ( from the , staphylÄ `` , `` bunch of grapes '' and Î Ï Î Î Î Ï , kÃ kkos , `` granule '' ) is a genus of Gram-positive bacteria .
Simplified: Î '' Î , staphylÄ `` , `` bunch of grapes '' and Î Ï Î Î Î Ï , kÃ kkos , `` granule '' ) is a genus of Gram-positive bacteria .