Hiroshima diary, the good doctor is describing what is going on after the atom bomb was detonated. One of the few structures left standing was a reinforced hospital. He mentioned many of the people would have as many as 40 to 60 stools a day. Nausea and vomiting too, sever desire to drink water. The body seeks to purify itself of toxins anyway it can.
Later when he got his hands on a microscope he discovered white blood cell counts to be very low the closer you are to the hypocenter (initial blast area).
6000 to 8000 was considered normal white blood cell count, those who were closest to the explosion ranged 1000 to 3000, and those who were getting ready to leave their body that day usually had about 100 to 300 cell counts.