Abstract:

Objectives：To investigate indoor air bacterial contamination of a kindergarten in Dali，and to explore the its relationship with the incidence of respiratou disease of young children．M ethods：Natural sedimentation method was applied to detect total bacterial count and hemolytic streptococcus of indoor air in 4 classrooms including the classroom of pre—school，lop class，middle class and bottom class in the kindergarten．Tracking survey of respiratory disease on children was conducted in 1 week after sampling and analyzed statistically．Results：The pass rate of total bacterial count was 50％ in air of all classrooms，henmlytic streptococcus was not detected．There is no significant difference in morbidity rates ofrespiratory tract infection among children with different gtades after slalistieal analysis(P>0．05)，and statistical analysis also showed that there is no significant difference between the morbidity rate of respiratory tract infeclion of children andtheIotaI1)acterial count ofindoorair(P>O．05)．Conclusion：Therewere still bacteria eontamination ofindoorairin part ofkindergartens in Dali City，management of air sanitation shonld be improved．

Key words: kindergarten, indoor air of classroom, total bacterial count, hemolytic streptococcus