Scientists map the global spread of HIV – through the Western world and beyond – for the first time: The major study finds that HIV travelled from the US to Western Europe on a number of occasions, whereas Central and Eastern Europe remained isolated for the most part of the early epidemic.

See the source article by following the link below:
Scientists map the global spread of HIV – through the Western world and beyond – for the first time: The major study finds that HIV travelled from the US to Western Europe on a number of occasions, whereas Central and Eastern Europe remained isolated for the most part of the early epidemic.