Like Omicron, BA.2 contains numerous mutations, according to researchers at the Massachusetts Consortium on Pathogen Readiness, a collaboration of academic researchers from different institutes in the Boston area who monitor genetic changes in SARS-CoV-2. About 20 mutations have been located in the antibody-binding regions that vaccines target. BA.2 also contains some mutations not found in BA.1, but scientists aren’t sure yet what those changes mean.“
https://time.com/6143069/new-omicron-variant-ba2/
Harvard Medical School
https://masscpr.hms.harvard.edu/covid-19-response-workshop