A genetic analysis of a large database of people with HIV in the UK in care shows that 18% of men with HIV who claim to be exclusively heterosexual in fact belong to clusters of linked infections that consist only of men.
This provides a minimum figure for the proportion of men with HIV in the UK who are what the researchers call non-disclosed MSM (ndMSM).
These ndMSM were considerably more likely to be of black African ethnicity rather than any other ethnic background. They were also very much less likely to have had a recent HIV infection.
Scientists have managed to reconstruct the route by which HIV arrived in the US – exonerating once and for all the man long blamed for the ensuing pandemic in the west.
Using sophisticated genetic techniques, an international team of researchers have revealed that the virus emerged from a pre-existing epidemic in the Caribbean, arrived in New York by the early 1970s and then spread westwards across the US.
Infection, Genetics and Evolution, Available online 2 June 2016
Human immunodeficiency virus type 1 (HIV-1) was discovered in the early 1980s when the virus had already established a pandemic. For at least three decades the epidemic in the Western World has been dominated by subtype B infections, as part of a sub-epidemic that traveled from Africa through Haiti to United States. However, the pattern of the subsequent spread still remains poorly understood.
Here we analyze a large dataset of globally representative HIV-1 subtype B strains to map their spread around the world over the last 50 years and describe significant spread patterns.
We show that subtype B travelled from North America to Western Europe in different occasions, while Central/Eastern Europe remained isolated for the most part of the early epidemic. Looking with more detail in European countries we see that the United Kingdom, France and Switzerland exchanged viral isolates with non-European countries than with European ones.
The observed pattern is likely to mirror geopolitical landmarks in the post-World War II era, namely the rise and the fall of the Iron Curtain and the European colonialism.
In conclusion, HIV-1 spread through specific migration routes which are consistent with geopolitical factors that affected human activities during the last 50 years, such as migration, tourism and trade. Our findings support the argument that epidemic control policies should be global and incorporate political and socioeconomic factors.