The number of cases is small, 32 reported in the United States in 2016, but this is double the amount of Cryptosporidium outbreaks since 2014. However, Cryptosporidium is more common in Europe (an average of close to 8,000 cases reported per year), and Australia (149 cases in December 2016 alone. The largest outbreak being 1,000 cases in New South Wales in 1998). This makes me wonder what people do in swimming pools.
Source : http://www.maryvilledailyforum.com/opinion/article_819ea2ae-632e-11e7-bf51-9f16f50f287a.html