Resistance toFasciola hepaticain calves harbouring primary patentSchistosoma bovisinfections

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Abstract
A substantial resistance to a heterologous challenge withFasciola hepaticawas demonstrated in calves harbouring primary patentSchistosoma bovisinfections of an age of 10 weeks at challenge, the mean worm burden being reduced by 29·9% (p < 0025) in calves primarily infected withS. bovisas compared with that of the challenge control group. The heterologous resistance was also evidenced by less pronounced liver tissue damage and lower serum gammaglutamyl-transpeptidase values in theS. boms-infected animals compared with the challenge control group.