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Overall comparison of infectivity measurements obtained with mice and cell cultures for untreated fresh oocysts of all isolates combined. Symbols: ○, CD-1 mice versus HCT-8 cells (R2 = 0.77); □, CD-1 mice versus Caco-2 cells (R2 = 0.67); ▵, CD-1 mice versus MDCK cells (R2 = 0.67). Each data point represents the average for all replicate analyses performed at each dose for the various isolates. All lines are best-fit linear regressions.
