TABLE 1.

Oocyst retention and biofilm thickness^a

Season	% Oocysts ± SE			Avg biofilm thickness (μm)
	In biofilm at end of dosing (day 3)	In biofilm at end of expt (day 8)	Accounted for in flow system
Summer 2008	64 ± 3.2	28 ± 0.05	107 ± 0.93	42 ± 3.5
Fall 2008	46 ± 4.5	24 ± 0.67	104 ± 0	28 ± 5.1
Winter 2009	72 ± 0.89	47 ± 3.2	97.5 ± 0.51	34 ± 10
Spring 2009	78 ± 1.4	65 ± 1.7	94.5 ± 0.53	25 ± 11
Winter 2009 (20°C)	77 ± 0.62	54 ± 1.4	94.5 ± 1.6	30 ± 12
Winter 2009 (5°C)	76 ± 0.31	53 ± 2.7	103.5 ± 0.48	33 ± 11

^aThe table presents a summary of the percentage of oocysts attached to each biofilm at the end of the dosing period (day 3) and end of the experiment (day 8), the total percent of oocysts accounted for in the flow system, and the average biofilm thickness for each set of seasonal biofilms. All errors are percent standard error (n = 2, except biofilm thickness, where n = 8).