And that my friend is the definition of a carrier well done!
Unless microbiology has changed in the past 25 years then S aureus is still found where S aureus has always been found and so by definition carried by
humans and also be definition some of these will be MRSA. This merely refers to what the bug is resistant to as a means of characterisation.
People are confusing infectious with the results of "opportunistic pathogenicity", they are not the same category but have the same (in gross terms)
net effect.i.e an infection.
In the UK a fair percentage of all nosocomial infections (hospital acquired) may in fact be identified as being initiated in hospital, but are in fact
given to the poor infected person by the visit of auntie Dorris or uncle Bert. Not necessarily by the hospital staff.
Washing hand of course helps, cleaning floors helps, in fact generally speaking removing bacteria is far preferable to eliminating them through the
use of gross poisons or toxins.
Disinfection is or was my area of specific expertise and an area I both studied and worked in actively for many years. We have not yet seen the
walnut resistant to the sledgehammer (bugs and disinfectants) but unless we start using these technologies more wisely and soon -we will. Now that is
a time to be worried, MRSA will be as nothing compared to what may /will happen then.