At the onset of the COVID-19 pandemic, masks were a recommended public health measure to prevent transmission of the virus. Yet new research suggests masks were ineffective at reducing the risk of infection when Omicron became the dominant variant.
In a study published in PLOS ONE, researchers found that several risk factors for infection, including wearing a mask, changed significantly in December 2021 when Omicron became the dominant SARS-CoV-2 variant.
