COVID-19 vaccines have been approved for use in the United States for 1 year, and despite being free and widely available, only 60.8% of Americans are fully vaccinated against the virus, while 72% have at received at least one dose of vaccine, and 26.6% have received a booster dose.Booster doses of vaccine may be necessary to stave off a wave of infections caused by the Omicron (B.1.1.29) variant, which is spreading across the country in the days before the holidays.1 in 100 older adults have diedAccording to an Axios analysis of Centers for Disease Control and Prevention (CDC) data, millions of US seniors have yet to get a booster shot.