Not to spoil your summer pool fun, but outbreaks of "crypto," a swimming-related diarrheal illness, are on the rise, according to a new report. From 2009 to 2017, there were nearly 450 outbreaks of crypto (short for cryptosporidiosis) reported in the U.S., which resulted in more than 7,400 illnesses, according to the report from the Centers for Disease Control and Prevention (CDC). What's more, outbreaks of the illness — which is caused by a hardy parasite called Cryptosporidium — increased 13 percent per year over the eight-year study period, the authors said. Cryptosporidium causes profuse, watery diarrhea that can last...