An ELISA was developed for serological detection of Echinococcus granulosus infection in dromedary camels. Antigen B (AgB) partially purified from hydatid cyst fluid of camels or sheep naturally infected with cystic echinococcosis (CE) due to E. granulosus, as well as a recombinant antigen B product (r-AgB) were used in an ELISA to screen panels of serum samples from slaughtered camels naturally infected with CE. Native hydatid cyst fluid antigen preparations were able to detect antibodies in sera from a significant proportion of camels with CE, as confirmed at post-mortem. Seroreactivity however, was variable. ELISA specificity for sera from naturally infected camels versus inspection-negative animals ranged from 90 to 99%. Native antigen B gave the highest sensitivity (97%) in ELISA for camel CE confirmed at slaughter. In contrast, r-AgB gave lower sensitivity for camel (84%) and sheep (28%) CE. The r-AgB-ELISA was, however, highly specific (90 and 95%) respectively for both camel and sheep natural CE infection. These results indicate that an ELISA based on serum antibody detection to AgB could be developed for immunodiagnosis of cystic echinococcosis in camels.
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