My advice consult a local professional who has dealt with this before. It's a serious problem that deserves the being treated as such.
If you keep the bedbugs out of your house you'll only have to deal with the two of them and their belongings. If you let them into your house you'll have a much bigger problem to deal with.
I had a look around and found this:
[h=2]Will bed bugs travel on people?[/h]
Bed bugs may hitch a ride on clothing that people wear, but they are not like lice and will not travel directly on a person. If you are concerned about bed bugs on clothing, remove suspect articles and place these items into a plastic bag. It would be preferable to remove clothing in a place with a non-carpeted floor, so bed bugs will have to travel some distance before finding a hiding spot. A wet cloth wiped over the floor area will help contain any bed bugs that may have attempted to escape.
http://www1.extension.umn.edu/garden...and-traveling/