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Kaplan–Meier survival curves for Sparicotyle chrysophrii larvae incubated at different concentrations of PTS and PTSO (0.5, 1 and 5 µg/mL each) at 0, 5, 30 and 60 min compared to control, using the long-rank test at a 95% confidence level. NS, not significant. ♦: Control group; ■: treatment group.
