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Percent occurrence of Cryptosporidium in water samples collected from Credit River area study sites between 2008 and 2010. WTPs, water treatment plants; STP, sewage treatment plant; 10 km, reference site located 10 km offshore from the mouth of the Credit River; influent, raw water entering WTPs; effluent, final treated wastewater leaving STP; surface, water collected at the surface above offshore WTP intakes, offshore STP outfall, and offshore of river mouths or 10 km offshore.
