A rapid microassay for detecting antibodies against poliovirus based on [14C]thymidine uptake of treated cell cultures

DNA synthesis of mammalian cells propagated in microplates can easily be measured if cell cultures incubated with [14C]thymidine are harvested on to glass fibre filters by a semiautomatic harvesting technique. Soon after infection with poliovirus, [14C]thymidine uptake of U cells (established, human amniotic cell line) is inhibited. This inhibition can be prevented by previous virus neutralization with antibody. Based on this effect a rapid, precise assay method was set up to determine neutralizing antibody titres against poliovirus. There was a good correlation between titres obtained by this assay and those obtained by 50% endpoint titrations in cytopathogenic effect inhibition assays