Abstract: After the emergence in 1980s, community-associated methicillin-resistant Staphylococcus aurues (CA-MRSA) has caught great attention of the researchers and clinical practitioners all over the world. In recent researching papers, people found that CA-MRSA's abilities to adapt itself to the hostile environment and to colonize is a kind of important virulence factor. A newly unveiled gene, designated arginine catabolic mobile element (ACME), in USA300 stains contributes much to this sort of ability. The arginine deiminase encoded by ACME plays an important role in colonization.

Key words: Staphylococcus aurues, methicillin-resistant, community-associated