The human cost of producing mustard gas was high. In December 1918 the chemical plant's medical officer reported that in the six months it was operational, there were 1,400 illnesses reported by its 1,100 mostly female workers - all medically attributable to their work. Three people died because of accidents, four died from associated illnesses, and there were 160 accidents resulting in over 1,000 burns. At Chittening there were reported 1,213 cases of associated illness, including two deaths which were later attributed to influenza.