Interesting item on the BBC concering the possibility that a gene (CCR5)that makes the current inhabitants of the former Roman Empire more susceptible to HIV infections was spread around in those times (here) .
Now although I haven't read the original report (will try to), the possibility of the propagation of genes around the Empire comes as no surprise.
Evidence from Hadrian's Wall which, apart from the initial building phase, was garrisoned by Roman auxilaries and not legionaries (the former were not citizens whereas the latter were - at least until later in the Empire when all free-born males were made citizens) indicates a huge range of people stationed there: Syrians, Spaniards, Gauls, Africans, Dacians (Modern Romania) ....
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