摘要：Few experiments have been reported on immunity to reinfection in domestic stock. The degree of resistance to reinfection with S. mattheei was studied in cattle and sheep. On the basis of the results, the only evidence of acquired immunity in calves and sheep is a reduction in the length of adult worms. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (310K), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References . 566 567 568
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