With drug-resistant strains of sexually-transmitted infection gonorrhoea increasing, scientists from Brighton, Oxford University and Public Health England have found that genetic sequencing can track the spread of infection. They show coordinated national and international strategies are required to stop drug-resistance spreading further.
Their study, funded by the National Institute for Health Research (NIHR) Oxford Biomedical Research Centre and the NIHR Healthcare-Associated Infections and Antimicrobial Resistance Health Protection Research Unit (HPRU), is published in The Lancet Infectious Disease.
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.