Newly published research in the journal Public Health Practice shows that a weekly program of nasal photodisinfection implemented at a major Western Canada meat packing plant, alongside standard safety measures recommended by the US Centre for Diseases Control and Prevention, reduced the expected COVID-19 positivity rate by over 99%, from 1,344 expected positive PCR tests to 3 positive PCR tests out of over 21,000 administered tests over a seven-month period.
