Objectives To explore the factors and features of nosocomial infections in locked and open wards of Psychiatry in order to ascertain effective preventive measures. Methods Nine thousand and eighty patients with schizophrenia who left a mental hospital in the city of Jining from January to December 2014 were retrospectively examined. Results One hundred and thirtyseven of 5 964 patients in a locked ward developed an infection,for a rate of infection of 2.30%.Twenty-two of 3 116 patients in an open ward devel...