antibody responses ( as measured by radioimmunoassay ) , alterations in serum levels of complement , and the presence of circulating immune complexes ( as measured by the fluid-phase c1q-binding assay , the fluid-phase conglutinin assay , and the activation of c1 were evaluated in 15 children after meningitis and/or bacteremia caused by streptococcus pneumoniae .
C0229671
serum
C0009498
complement