eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2013-06-28 10 1 10.13005/bbra/1087 9858 article Omar H.M. Shair 1 Department of Botany and Microbiology, King Saud University, College of Science, P.O. Box: 1811, 11333, Riyadh Saudi Arabia. This study evaluatedthe bacterial contamination of air conditions in houses of Umul-Alhamaam in Saudi Arabia; by determining the bacteria and associated antibiotic resistance of the isolates. Cultures from 10 surface air-conditions rooms were obtained.The newly filtered air-conditioned rooms were found to have significantly smaller number of bacteria 103cfu. But it was found a significantly greater number of Bacillus in unfiltered air-condition 106 cfu. This study was conducted in Riyadh, Saudi Arabia during 2011-2013. People living in these houses were exposed indirectly to additional bacterial reservoirs through breathing of contaminated air in their rooms. The newly filtered air-conditioned rooms were found to have significantly smaller numberof Bacillus colonies and Staphylococcus colonies while it was found significantly greater number of Bacillus colonies in unfiltered air-conditions without Staphylococcus colonies. Antibiotic sensitivity test were prepared against bacterial isolates and the results were interpreted. A preliminary health status survey revealed that the occupants of air-conditioned homes without filter had more complaints of eye irritation, sneezing, nasal congestion, and cough. To address of this issues of bacterial related illness, there should be an urgent need for studies using objective markers of illness, relevant animal models, proper epidemiologic techniques, and examination of confounding factors. Here I report of severe bacterial pathogenic as a result of indoor bacterial contamination. https://www.biotech-asia.org/vol10no1/bacillus-contaminated-air-conditions-acs-in-homes-at-areas-of-umul-hamam-saudi-arabia/ Air-condition filter; cough; Pathogenic bacteria; Contamination; Bacillus