CA-MRSA commonly contains SCCmec elements of
type 4 or type 5 which have stronger transmissibility
as a result of a smaller size than other elements. The
arginine catabolic mobile genetic element (ACME) of
certain strains contains a spermidin acetyltransferase
gene (speG) which transfers resistance to spermidin and
other polyamines (73). Furthermore, there is an arginine
deiminase and an oligopeptide gene cluster located on
ACME, which can promote colonization of CA-MRSA,
but there are still no unimpugnable experimental results
to support this theory (72). Meanwhile, CA-MRSA
utilizes surface adhesions in a different way from other
strains and mechanism studies are still in progress