First, the good news: The United States reported a record-high 4.6 million doses of vaccines administered in one day, according to data published Saturday by the CDC. "… Now the bad news: For the third straight week, new Covid-19 cases and hospitalizations are increasing, according to CDC Director Dr. Rochelle Walenky. "Cases and emergency room visits are up," Walensky said Friday. "We are seeing these increases in younger adults, most of whom have not yet been vaccinated."