[Pollution Characteristics of Antibiotic Resistant Bacteria from Atmospheric Environment of Animal Feeding Operations].

Animal feeding operations is considered as a source of airborne human pathogens and antibiotics genes. In this study, we investigated the concentration, size distribution and aerodynamic diameter of airborne bacteria, tetracycline resistant bacteria and erythromycin resistant bacteria from 22 animal feeding operations in three districts of Beijing. The results indicated that the highest and lowest concentrations of these three types of bioaerosol were detected in pig and cow house, respectively. The concentration of airborne bacteria was higher in layer house, whereas concentration of antibiotic resistant bacteria was higher in broiler house. Tetracycline and erythromycin resistant bacteria were detected from the atmospheric environment from out door of layer and broiler house with the percentages of 8.81%, 15.89% and 23.19%, 36.53%, respectively. The size distribution and aerodynamic diameter varied from inside and outside of pig, cow, and layer and broiler house. Most of tetracycline resistant bacteria and erythromycin resistant bacteria from current four types of animal feeding operations mainly deposited in pharynx, larynx and bronchus of respiratory system. This study would offer the base data for evaluating the detriment of bioaerosol from animal feeding operations to the worker and environment.