Why Did the Use of the Mask not Control the Infection Caused by COVID‑19 in the World? Where is the Missing Loop?

Masoud Mohammadi


Dear Editor, The spread of COVID-19 in December 2019 and the spread of this infection led to a global epidemic, and as of October 26, 2021, more than 243 million confirmed infected cases, and over 4953,246 deaths were reported globally.


COVID‑19; Infection; Missing Loop

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