For passive transfer experiments, mice were bled 2 wk after the last immunization with KLH or LAH-KLH or 3 wk after infection with PR8 computer virus or A/Hong Kong/1/1968 computer virus
For passive transfer experiments, mice were bled 2 wk after the last immunization with KLH or LAH-KLH or 3 wk after infection with PR8 computer …