Maricopa County COVID-19 Update

  • 98,206 total COVID-19 cases since January; 4% hospitalized; 1% ICU, View County Data:
  • Mask mandate in effect for Maricopa County: Face coverings required in enclosed public spaces, read about regulations.
  • County services impacted by the pandemic. View updates >


  1. Howard, J.; Huang, A.; Li, Z.; Tufekci, Z.; Zdimal, V.; van der Westhuizen, H.; von Delft, A.; Price, A.; Fridman, L.; Tang, L.; Tang, V.; Watson, G.L.; Bax, C.E.; Shaikh, R.; Questier, F.; Hernandez, D.; Chu, L.F.; Ramirez, C.M.; Rimoin, A.W. Face Masks Against COVID-19: An Evidence Review. Preprints 2020, 2020040203 —
  2. C. Raina MacIntyre , Abrar Ahmad Chughtai View Of The Efficacy Of Face Masks And Respirators Against Coronaviruses And Other Respiratory Transmissible Viruses For The Community, Health- Care Workers And Sick Patients, International Journal of Nursing Studies (2020), doi:
  3. A. Davies, et al., Testing the Efficacy of Homemade Masks: Would They Protect in an Influenza Pandemic? Disaster Medicine Public Heal. Prep. 7, 413–418 (2013).
  4. S Rengasamy, B Eimer, RE Shaffer, Simple Respiratory Protection. Evaluation of the Filtration Performance of Cloth Masks and Common Fabric Materials Against 201000 nm Size Particles. The Annals Occup. Hyg. 54, 789–798 (2010).
  5. Mvd Sande, P Teunis, R Sabel, Professional and Home-Made Face Masks Reduce Exposure to Respiratory Infections among the General Population. PLOS ONE 3, e2618 (2008).
  6. Abhiteja Konda, Abhinav Prakash, Gregory A. Moss, Michael Schmoldt, Gregory D. Grant, and Supratik Guh. Aerosol filtration efficiency of common fabrics used in respiratory cloth masks. ACS Nano. 2020;14:6339–6347.




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