Astma-Protective Microbiota in Urban Homes (image) National Institute for Health and Welfare Share Print E-Mail Caption Astma-protective microbiota in urban homes had high abundance of bacteria of the outdoor environment. Credit National Institute for Health and Welfare Usage Restrictions To be used only in content related to this study. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.