It doesn't exactly seem to be widely advertised, and a lot of the press coverage is misleading. There was some (rather confused) discussion of this problem on H

It doesn't exactly seem to be widely advertised, and a lot of the press coverage is misleading. There was some (rather confused) discussion of this problem on HN a month or so ago: https://news.ycombinator.com/item?id=21730795 https://news.ycombinator.com/item?id=21730795 That article, like others, made the horrendously wrong claim that types 2 and 3 of the poliovirus had been eradicated. They hadn't. The original wild versions had, but vaccine-derived versions of them which were every bit as dangeorus as the originals were in increasingly widespread circulation - the only difference, as far as I know, is that we can use genetic testing to trace their lineage back to the vaccine. The slightly better publications like Ars Technica qualified this by saying that this only applied to wild-type polio viruses and did mention vaccine-derived polio, but they severely downplayed how much of a problem this was for the campaign to eradicate polio.