Epidemiological investigation on an eye irritation outbreak in one primary school in Shenzhen City

Objective To conduct epidemiological investigation and analysis on an eye irritation outbreak in one primary school.Methods The field epidemiology survey and etiology infer principles were adopted in this study.Results A total of 108 cases whose eyes were pain or itchy were found in this incident,the attack rate was 33.5%(108/322).The peak incidence was between 10:00-11:00,all the cases were first grader students and attack rate was 33.5%(108/322),which had statistical differences (X2 =57.07,P=0.00).Insecticidal measures carried two days before the incident was the cause of the incident.After the evacuation of personal' s from the classrooms and cleaning the classrooms thoroughly,the incident was terminated rapidly.Conclusion The event is a group irritation event caused by insecticide residues.