evidence: The Food and Drug Administration on Thursday approved the new Covid vaccines from Pfizer and Moderna. [...] The timing of the new vaccines — last year's rollout was in mid-September — is significant, since most of the U.S. is still caught in the summer wave of Covid illness. As of Monday, the Centers for Disease Control and Prevention reported, the number of people testing positive for Covid keeps rising and emergency room visits for Covid have been increasing since mid-May. Hospitalizations are rising, too. [...] As of May 11, only 22.5% of adults got last year’s updated Covid vaccine, according to data from the CDC. Only 14.4% of children ages 6 months through 17 years got vaccinated.