Don T, you do not need to worry about the influx of large numbers of infected and high risk immigarants.
The few hundred hetero infections in a single year are more than ample to start an epidemic if one were possible, never mind the thousands of heteros who must now have it.

It has been in the hetero population for decades, but has proved incapable of causing an epidemic as in the MSM and Black African communities.

And remember, the African strain is even less virulent.