On the morning of June 27, 2011, human error resulted in the mixing of an acidic solution of Fresh FX, an antimicrobial used in poultry processing, with a sodium hypochlorite solution. This mixing of chemicals caused a release of chlorine gas into the plant. About 600 employees who were at work at the time of the release were evacuated. NIOSH received a request for technical assistance from OSHA to evaluate employee health effects after the chlorine gas release. What NIOSH found: 1) labeling in English only and lack of literacy in English contributed to the chlorine gas release; 2) 116 (21%) participants had asthma symptoms 4 months after the release. Of these, three participants had breathing tests consistent with reactive airway dysfunction syndrome 6 months after the release; 106 (19%) participants had posttraumatic stress disorder symptoms 4 months after the release. The report…