exposure of the entodermal cells of the allantois of eggs deembryonated shortiy after injection of saturation or near saturation inocula of standard seed to large quantities of infectious virus added to the media at various times after infection and not extending over more than 2 hours resulted in a decrease of the id ( 50 ) /ha ratios of the progenies only during the first 2 or possibly 4 hours after the primary inoculation .
C0042769
infectious virus
C0009450
infection