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Detectability of oocysts aged 3 to 15.6 months, conserved at 4°C in H2SO4 (2%), after inoculation in soil. (A) Proportion of oocysts counted under a UV microscope after recovery from soil samples inoculated with 105 oocysts; (B) CT values obtained from qPCR performed after recovery of oocysts from soil samples inoculated with 105 and 103 oocysts as a function of time (days; 1 day corresponds to oocysts aged 3 months).
