exsheathing fluid (ef) and excretory-secretory products (es) of infective third-stage cultured larvae ofostertagia circumcincta were analysed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (sdspage). five and seven predominant proteins were found in the ef and es products, respectively. immunoblotting by sheep pre-infection serum did not react with any of the ef and es proteins, b...