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Shares of Moderna (MRNA) and Pfizer (PFE) are on the move after Pfizer CFO David Denton projected a COVID vaccination rate of only 24% this year in the U.S. The demand for COVID vaccinations has dwindled, with data indicating it's less than half of what is expected for flu shots. Despite Moderna's efforts to expand its business, it remains heavily reliant on COVID vaccinations and booster shots. Yahoo Finance's Seana Smith and Brad Smith discuss the details of how the declining demand for COVID immunizations could affect vaccine makers moving forward.