From the Daily Standard: 

"More than a dozen people claim to be sick due to exposure to toxins in Grand Lake, although officials say they may never be able to confirm the link.

Grand Lake is one of three in Ohio with posted health advisories due to algae blooms, but is the only one suspected of making people ill, a state health official said Tuesday.
A water quality advisory remains in place for the 13,500-acre inland lake to warn people not to swim, boat or eat the fish caught within its shores due to the unsafe toxin levels produced by the blue-green algae.
Fourteen people have contacted local and state officials since July 9 complaining of various symptoms they believe are related to exposure to Grand Lake, according to Jen House, spokeswoman for the Ohio Department of Health…"