https://www.thebodypro.com/article/interim-recommendations-facemask-respirator-use-reduce-2009-influ
Adverse Events, Comorbidities, and HIVColds and Influenza

Interim Recommendations for Facemask and Respirator Use to Reduce 2009 Influenza A (H1N1) Virus Transmission

    Centers for Disease Control and Prevention

    Centers for Disease Control and Prevention

    The CDC is a U.S. federal government agency charged with protecting public health.