Not much, at least when it comes to AIDS, at least. You see, we never part of the empire:
The spread of the Roman Empire through Europe could help explain why those living in its former colonies are more vulnerable to HIV.But was it intentional? Probably not:
The claim, by French researchers, is that people once ruled by Rome are less likely to have a gene variant which protects against HIV.
However, the researchers do not believe that the genetic difference is due to Roman soldiers or officials breeding within the local population - history suggests this was not particularly widespread, and that invading and occupying armies could have been drawn not just from Italy but from other parts of the empire.Just like a conquering power, huh?
Instead, they say that the Romans may have introduced an unknown disease to which people with the CCR5-Delta32 variant were particularly susceptible.
See what we missed out on?