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Effect of oocyst loading rate on oocyst retention by biofilm. The cumulative number of oocysts associated with a biofilm (Cranberry Creek biofilm collected in July 2009) over time under different oocyst loading rate conditions was determined. Error bars indicate the standard error (n = 2) and are smaller than the symbols where not visible. The thick line on the time axis indicates the period of oocyst dosing (0 to 72 h).
