Air Dynamic Disinfection and Hospital Infection

OBJECTIVE To observe the constant disinfection effect of air dynamic purification. METHODS From Sept 2000 to Dec 2001, the air disinfection in two same-bulk neonatal wards of our hospital was performed by using two methods of the dynamic state (group A) and static state (group B) air disinfection,and the hygienic surveillance and patients′respiratory infection incidences of the two wards were conducted. RESULTS When air-purified disinfection was done according to air dynamic disinfection for controlling certain population flowings,bacteria were controlled within the field of the National Standard (≤200 CFU/m 3), when there were persons′activities after ultraviolet static disinfection, the number of bacteria was over 5-20 folds of the National Standard. Their t test value was P0.05. The differences of the two groups were markedly significant.The constant disinfection of the air dynamic purification was better than the transient one of the static state. Among 215 neonates of group A, 7 cases suffered from upper respiratory infection (URI), their morbidity rate was 3 26%; among 261 cases of group B, 20 cases had URI, the morbidity rate was 7.66%. Especially, during the epidemic season of influenza, the morbidity of group A was 2.22%, that of group B was 13.56%. Their χ 2 test value was P0 05,and markedly significant. CONCLUSIONS The method of group A can keep the indoor purity and be beneficial to the prevention and control of URI.