On Friday May 7, the United States Centers for Disease Control and Prevention (CDC) released new public recommendations to account for the coronavirus disease 2019 (COVID-19) airborne transmission. The CDC now accounts both transmission of the SARS-CoV-2 virus and infection causing COVID-19 disease can result from inhaled fine respiratory bioaerosol particles.
The new guidelines are completely aligned with scientific perspectives that are one year old at this time. On the contrary to airborne transmission, the previous official statement of the CDC was that the majority of infections occurred via close contact with large droplets and fomites. Back on April 7, 2020, a novel perspective from Marcelo Guzman, a chemistry professor at the University of Kentucky with an environmental science ad engineering Ph.D. degree from Caltech was published as a preprint attempting to persuade scientists and public health officials to pay serious attention to the SARS-CoV-2 airborne threat. A second version of the preprint was later released on April 22, and finally passed peer-review for open access journal publication on December 8 in the International Journal of Health Planning and Management. This work unequivocally explained the danger of small bioaerosol particles that can remain in the air over time and penetrate different levels of the respiratory system.
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