in a study of sera from cattle vaccinated with 3 x 10 ( 10 ) cfu of brucella abortus strain 19 , it was found that igg1 antibody measured by an indirect elisa was the only isotype to correlate with standard complement fixing antibody titers using heated serum samples and guinea pig serum as a source of complement .
C0229671
serum
C0009498
complement