摘要To the Editor:Methicillin-resistant Staphylococcus aureus (MRSA) are a group of gram-positive bacteria that cause a wide range of diseases in children.[1] Surveillance of MRSA is particularly important since certain clones have spread over wide geographical regions.The MRSA clones that have spread in North China over the past decade include ST59-SCCmecⅣa-t437,ST59-SCCmecⅤ-t437,and ST239-SCCmecⅢ-t030.MRSA toxins that can damage the host cell membrane include α,β,δ,and γhemolysin.The hemolytic activities of these toxins were described in 1944 by Christie,Atkins,and Munch-Petersen (which was called the CAMP reaction),[2] The hemolytic activities of MRSA isolated from Chinese children have not yet been determined.The aim of this study was to provide novel insights into hemolytic activities of these isolates.