Immunoglobulin concentrations and bovine enterovirus inhibitors in fetal bovine fluids.

: Fluids from 53 bovine fetuses ranging in age from 90 to 240 days were examined for immunoglobulin G (IgG) and immunoglobulin M (IgM) and neutralizing activity to ten bovine viruses. Non-specific inhibitors to bovine enteroviruses were found in serum, allantoic, and amniotic fluids of most samples tested. In most cases, serum IgG were within normal values. Neither IgG nor IgM was detected in amniotic fluids, whereas 2 samples of allantoic fluid contained traces of IgG.