Deschutes County officials issued a health advisory for Elk Lake Resort Friday after the resorts' water tested positive for E-Coli bacteria. Several guests at the resort became ill with symptoms of vomiting and diarrhea, prompting the resort to close until further notice. Deschutes County Community Health Program Manager Tom Kuhn says they will continue to test the water, but it can take time. "There’s really a variety of ways that the water could become contaminated; it's just trying to find the source of the contamination. Even then, when you find a potential source of the contamination, you don don't always know that, that was the particular source areas. So, sometime it's very difficult to determine." Kuhn says water samples are now at the lab and they could get some results next week; .but the resort won't reopen until the water tests clear from any contaminates. Until then, Elk Lake itself is open, but the resort will remain closed.