This graph interests me, though I haven't a clue what's going on. I generated it from the magnificent WHO database at https://data.euro.who.int/hfadb/
Why did our rate in the UK increase so rapidly from 1998 to 2005? Why did it plummet again? And why are our rates so much worse than comparable countries in Europe?? All suggestions gratefully received
Meanwhile over in Massachusetts they are rightly proud of their success against HIV. I'm not sure if it's comparing like with like, but the paper states that their new HIV diagnosis rate declined from 18.7 in 2000 to 9.3 in 2014 (per 100 000). That's a very different trajectory to what we see above.
All very mysterious!