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Mean faecal worm egg count (WEC) during 20 years of simulation of worm infection in sheep under Scenario 5. Mechanism by which sheep reduce WEC are (A) reduced worm establishment or (B) increased worm mortality; the frequency of the low WEC A allele in sheep was investigated at 11 levels, from low (light blue) to high (dark blue) frequencies and also when the allele is absent (black).
