FIG. 6.

Oocyst survival and temperatures observed in surface soil experiment 2 (January 1998 to May 1998). (A) Viability (potential infectivity) of sentinel and control oocysts that were exposed to a surface soil environment as determined by the dye permeability assay. Each point represents the mean percentage sum of DAPI⁻ PI⁻ and DAPI⁺ PI⁻ ± standard error of three replicates and two subsamples of each replicate, for a total of six subsamples with 100 oocysts characterized at random per subsample. (B) Average daily temperature of the surface soil where sentinels and controls were situated.