High levels of E. coli detected at Avocado Lake Swim Beach prompted health experts to advise against swimming at the east Fresno County lake.

The Central Valley Water Board received the warning about the bacteria after a routine monitoring on Wednesday. In addition to not swimming, experts also say to not drink any water from the lake, and don’t use it for cooking for washing.

E. coli is often found in the intestines of warm-blooded animals. For experts, it indicates the presence of fecal pollution in the water. Most E. coli strains are harmless.

However, some strains can cause diarrhea, abdominal cramps and pain, nausea and vomiting. And, in severe cases — particularly for children and the elderly — E. coli can cause kidney failure leading to death.

Those with health concerns should contact their health care provider. An interactive map of water quality warnings throughout Fresno County can be found here.