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Infectivities of the Iowa (○) (R2 = 0.57) and Moredun (□) (R2 = 0.62) isolates of C. parvum in HCT-8 cell monolayers based on individual logit calculations for each oocyst challenge dose. The ID50s based on these dose-response curves were 106 oocysts for the Iowa isolate and 30 oocysts for the Moredun isolate.
