STUDIES ON CROSS-TRANSMISSION AND PATHOGENICITY OF Haemonchus contortus IN WHITE-TAILED DEER, DOMESTIC CATTLE AND SHEEP

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Abstract
Experiments were conducted to compare the relative pathogenicity and infectivity of deer- and cattle-derived H. contortus for 3 hosts, white-tailed deer, cattle and domestic sheep. Parameters evaluated for all animals were general physical condition, basic hematologic values, fecal egg counts and parasite infectivity rates. Clinical signs attributable to H. contortus infections were not observed in any of the experimental animals. Deer harboring H. contortus burdens > 70 worms/kg body wt had decreased packed cell volume, Hb and total serum protein values. Statistical analyses indicated there was no significant difference (P > 0.05) in infectivity of deer-derived H. contortus in these hosts. No significant difference (P > 0.05) in infectivity for deer was noted between deer-derived H. contortus and cattle-derived H. contortus. Morphometric comparisons of helminths recovered indicated that parasites of deer and cattle origin were both compatible with the description for H. contortus. Probably, cross-transmission of H. contortus occurs between deer and domestic livestock.

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