People with MRSA only need to be barrier nursed if they have an infected open site and need to be in hospital. This is to protect other patients who are likely to be unwell and less able to fight off infection.
Most of us at some time are colonised with MRSA (have a colony of it living in or on us) The thing comes and goes and we may never be aware that it was there.
If the person is well generally and okay to travel, any wound should be kept well covered...on either of you, and you practice good general hygiene then there should be no problem.
If you want more advice then post a bit more detail
here's a useful link
http://www.nhsdirect.nhs.uk/articles/article.a spx?articleId=252§ionId=10
until recent retirement, I worked in the NHS in the community (peoples' homes) The MRSA infection rate is very low because we are told to treat everyone as though they are infected. This basically means WASH YOUR HANDS THOROUGHLY, wear clean clothes, generally practice good hygiene.
hth