SDS PAGE PROFILES OF SOMATIC PROTEINS FROM 3RD-STAGE INFECTIVE LARVAEOF OSTERTAGIA-OSTERTAGI AND COOPERIA-ONCOPHORA

Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) p rofiles of somatic proteins from third-stage infective larvae of Oster tagia ostertagi and Cooperia oncophora were evaluated using laser dens itometry. Several protein bands were present from both parasite prepar ations. A few bands from each parasite appeared to be unique. Purifica tion of these proteins for use in serologic monitoring of cattle natur ally infected with O. ostertagi and C. oncophora should allow circumve ntion of cross-reactivity between the two genera, which has been repor ted by others.