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Comparative sensitivity of different serological tests for seromonitoring and surveillance of Edwardsiella tarda infection of Indian major carps

Comparative sensitivity of different serological tests for seromonitoring and surveillance of Edwardsiella tarda infection of Indian major carps

Fish and Shellfish Immunology 15(4): 333-340

ISSN/ISBN: 1050-4648

PMID: 12969654

DOI: 10.1016/s1050-4648(02)00178-x

Different serological tests viz. indirect ELISA, indirect blocking ELISA, competitive ELISA and serum agglutination tests were evaluated to detect antibodies against Edwardsiella tarda in naturally infected fish sera for seromonitoring and epizootiological studies. Approximately 66.6, 62.5, 57.6 and 16.6% of the field sera samples were found to be positive by indirect ELISA, competitive ELISA, indirect blocking ELISA and serum agglutination test, respectively. The percentage of serum samples positive for E. tarda antibodies in serum agglutination, competitive ELISA and indirect blocking ELISA, when compared with indirect ELISA, were 33.3, 83.6 and 66.6%, respectively, but its use was restricted due to the requirement of several conjugates against different fish species and the difficulty in assaying large numbers of serum samples from different fish species in a limited time to enable seromonitoring of the disease prevalence. No significant difference (P<0.05) in the mean optical density value was found in indirect and competitive ELISA. Although the competitive ELISA was slightly less sensitive than the indirect ELISA, it could accommodate a large number of serum samples with one anti-rabbit conjugate, and the need for different fish conjugates as required in indirect ELISA was eliminated. As in medical and veterinary practices, these tests can now be used in aquaculture practices for seromonitoring and study of pre-exposure of Indian major carps to pathogens in enzootic areas.

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