I'm sort of surprised that the US was more interested in biological weapons here than the Soviet's but, on reflection, that probably has more to do with post Eisenhower US strategy. The later attitude was that weapons that take over a day to kill wouldn't be useful in a nuclear war that would be over in hours but of course nobody was thinking in those terms in 1945. But the Russians had a different view and kept anthrax warheads on their ICBMs pointed at US cities through the Cold War. I'm not sure which attitude is scarier.