[RonF]

No. The cells in transfused blood don't reproduce, but slowly die off and are replaced by one's own blood as the blood-cell producing cells in your bone marrow (and elsewhere) operate on their normal cycle.

If a DNA profile was performed on your blood soon after you had received a transfusion, there'd be some confusion, as both profiles would be mixed together. But after a few weeks, the transfused cells would be gone.

[Minnesoootan]

Thanks for the answer to a question that has always bothered me,but out of laziness I never researched.