At the end of April, more than 9,000 Americans were reported to be infected after being vaccinated, according to the U.S. Centers for Disease Control and Prevention. The next day, it came back positive more than a month after she had been fully vaccinated. But Greninger said he’s seen a few cases where people developed strong immune responses to the vaccines, yet still got infected. Landon tested positive for Covid in late March after being fully vaccinated, she said. The first time she was infected came last fall, before she got vaccinated.
