This is only declared an emergency for the fact that this is a 4 to 5 times multiplication of the pervious years’ HIV cases reported to have been acquired from dirty needles. Read the article.
It’s been well known that there’s a higher than normal correlation between gays and iv drug users being the same people or circulating in the same groups of people. Both are high risk behaviors and go together (correlate) at higher than normal rates than the general heteroseual population.
So personally I am still not surprised.