'COVID has not disappeared, although it may have gone from many people's minds,' Dr. William Schaffner, professor at Vanderbilt University Medical Center, told ABC News. 'I'm afraid the COVID virus is still very much with us.'
'Many people, although they have been vaccinated in the past, have not taken advantage of this updated vaccine,' Schaffner said. 'And the protection afforded by the previous vaccinations is now slowly declining. And so, we have a highly vulnerable population whose protection is slowly waning.'
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