Dr Anthony Fauci, the nation's top infectious disease expert, warns that the Omicron variant may not spell the end of the COVID-19 pandemic. Fauci, director of the National Institute of Allergies and Infectious Disease, told the Davos Agenda virtual event Monday that 'natural vaccination' - or immunity via previous infection - might not be as effective as some believe. Like the emergence of Omicron, there is potential for a new variant to emerge in the future that can bypass the natural immunity provided by infection from the new strain.