DAYTON, OH (AP) - Nearly one-third of Ohio's beaches are under health advisories after tests yielded high levels of E. coli bacteria that could sicken swimmers.



Brian Miller, of the state Division of Parks and Recreation, tells The Dayton Daily News (http://bit.ly/1GSYuCO ) officials want people to be aware of the advisories as they head to beaches for the holiday weekend.



Three out of every 10 public beaches are under advisories this week. Local beaches at Caesar Creek, Cowan Lake and Hueston Woods have been issued advisories.



Miller says he can't recall a June where he's seen this many spikes in E. coli bacteria. He says heavy rains, stressed sewage systems and geese have all been to blame for the issue.



Children, the elderly and those with weakened immune systems are advised not to swim during an advisory.