Abstract
The mode of multiplication of influenza virus were studied by measuring hemagglutinin titers when 600r was irradiated 60min. and 180th min. after they were inoculated in allantoic cavities.
The result revealed that their growth was distinctly accelerated than in control groups. However, titers obtained at 6th hours and a half and 8th hours after the inoculation showed that viral growth was inhibited at these both stages where complete virus was increasing.
The invasion and damage of allantoic membrane occured about two hours earlier in the group which was given 600r 3 hours after the time of inoculation than in the group which was not irradiated.
