Various immunization procedures were investigated in an effort to improve the number of hybridomas producing antibodies against Cysticercus cellulosae. Ten groups of 5 BALB/c mice were subjected to different immunization procedures and were bled repeatedly over a period of 68 days. The samples of sera thus obtained were tested by enzyme linked immunosorbent assay : total immunoglobulins, lgG and IgM levels were determined. In general, total anticyst antibody titres increased during the course of immunization but in 3 groups the final titre was lower than the maximal antibody titre. Overall, immune tolerance did not appear to be a problem and longer immunization programs seemed to end with slightly higher antibody levels. So far, 4 mice from the group that exhibited the highest immunoglobulin levels have been used for hybridoma production. Out of 124 hybridomas thus obtained, only 1 secreted antibodies against Cysticercus cellulosae.
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