Nearly 10,300 SARS-CoV-2 infections have occurred in vaccinated people in the United States as of the end of April, out of about 101 million people who had received the full series of vaccine jabs, the researchers reported May 25 in the CDC's Morbidity and Mortality Weekly Report. … More than one in four breakthrough infections came without any symptoms at all, as was the case with Maher's infection, the findings showed.