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Propeller Health, the leading digital solution for respiratory medicine, today announced the closing of its $21.5 million Series C financing. The funding round includes new investors 3M Ventures, S.R. One, Limited and Hikma Ventures, and existing investors Safeguard Scientifics and Social Capital. Proceeds will be used to expand Propeller’s digitally-guided therapy platform and modernize the management of respiratory disease.

Despite an abundance of effective medications, the burden of chronic respiratory disease remains unacceptably high. Asthma and chronic obstructive pulmonary disease (COPD) continue to negatively impact the lives of over 50 million people and cost payers and patients in the United States over $100 billion annually. Many patients need help to better manage conditions on their own, while physicians lack tools to understand how their patients are doing between visits and to adjust therapy to match their levels of impairment and risk.