"[Immune imprinting] could be a problem if the person was unable to mount a useful immune response against a new variant," Dr. Stanley Perlman, an immunologist and microbiologist at the University of Iowa, told The Epoch Times. He was not involved in the study. While that did not occur in this study, most of the antibodies made following vaccination targeted the original COVID-19 variant and not XBB.1.5. Surprising Findings"Imprinting is not a new concept, but the situation we are looking at seems to be quite unique," said David Veesler, who has a doctorate in structural biology, is a professor and chair in the Department of Biochemistry at UW, and an investigator with the Howard Hughes Medical Institute, in a press release.