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Seasonal changes in oocyst retention by biofilms using a standard laboratory water temperature (20 to 25°C). The cumulative percentage of oocysts associated with the biofilm over time for summer, fall, winter, and spring biofilm cultures was determined. Error bars show the percent standard error (n = 2) and are smaller than the symbols where not visible. The black line on the time axis indicates the period of oocyst dosing (0 to 72 h).
