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Pathogenicity of Ostertagia leptospicularis for cattle and sheep

Pathogenicity of Ostertagia leptospicularis for cattle and sheep

Zentralblatt für Veterinarmedizin. Reihe B. Journal of Veterinary Medicine. Series B 31(3): 189-202

The infection of sheep with a mixture of 3rd stage larvae of Ostertagia ostertagi, O. leptospicularis and Skrjabinagia lyrata of cattle origin resulted in the selection of a pure isolate of O. leptospicularis after the 2nd passage. This isolate was used for the infection of 4 calves (4.5-5.5 mo. old) and 4 sheep (8-9 mo. old) with 1000 3rd stage larvae/kg body wt. The prepatent period of O. leptospicularis was 16-18 days in cattle and 17-18 days in sheep. Peak egg counts with maximum values .apprx. 2000/g and 5500/g occurred between days 21-22 and 21-28 post infection (p.i.) in cattle and sheep, respectively. Clinical symptoms (anorexia, diarrhea) were only observed in 3 of 4 calves at days 20-23 p.i. In both animal species the serum levels of pepsinogen and gastrin increased 1 and 2 wk p.i., respectively. In some animals blood eosinophile cell counts were elevated.

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Accession: 006071474

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PMID: 6730797

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